Why is Cobalt (Co) placed before Nickel (Ni) on the Periodic Table of the Elements even though it has a higher average atomic mass than nickel?



Nickel has fewer electrons.



Cobalt has a lower density.



Cobalt was discovered first.



Nickel has one more proton.

Answers

Answer 1

Answer: Nickel has one more proton.

Explanation:

The Periodic table orders elements based on their atomic number not by their atomic mass even though this order usually coincides with the atomic masses of the elements. Occasionally however, this is not the case as is proven by Cobalt and Nickel.

The atomic number of an element refers to the number of protons that the element has in its nucleus. Cobalt has 27 protons whilst Nickel has one more proton at 28 which is why it comes after Cobalt.

Answer 2

Answer:

lower density

Explanation:


Related Questions

Hope is testing a substance using blue litmus paper. The paper turns red. The substance is _____.
a neutral
an acid
a base

Answers

Answer:

the substance is an acid

The scientific theory of plate tectonics states that the Earth's crust is composed of many plates, or slabs of rock. Interactions of these plates have created different landforms, or geologic features. Which of the following statements provides evidence for this theory?
A.
A large earthquake off the coast of Japan induces a wave that is over twenty feet high.
B.
An iceberg buckles the hull of the Titanic and allows water to enter between the steel plates.
C.
The city of Pompeii is perfectly preserved under volcanic ash following the eruption of Mount Vesuvius.
D.
Fossilized marine creatures can be found at the top of the Himalayan Mountains.

Answers

Answer:

study island

proof

Explanation:

Fossilized marine creatures found at the top of the Himalayan Mountains provide evidence for a scientific theory of plate tectonics. Therefore, option (D) is correct.

What is Plate tectonics?

Plate tectonics can be explained as the Earth's lithosphere being made of a large number of tectonic plates that have been slowly moving since about 3.4 billion years ago.

The lithosphere is broken into 7 or 8 major plates and many minor plates or "platelets". These plates meet, and their relative motion evaluates the kind of plate boundary: convergent, transform, or divergent.

Mountain-building, Earthquakes, volcanic activity, and oceanic trench formation take place along these plate boundaries. The relative annual movement of the plates ranges from 0 to 10 cm.

Tectonic plates are comprised of the oceanic and the thicker continental lithosphere. The process of subduction which is actually one plate moving under another carries the edge of the lower plate down into the mantle along convergent boundaries.

Pebbles, Shells, and marine fossils found in the limestone beds of the tallest Himalayas Mountains give evidence of the theory of plate tectonics.

Learn more about plate tectonics, here:

brainly.com/question/19317822

#SPJ6

The volume of an ideally behaving gas is 300 L at 227°C. What volume will the gas occupy at 27°C when pressure remains constant?

Answers

Answer:

[tex]V_2=35.68\ L[/tex]

Explanation:

Initial volume, V₁ = 300 L

Temperature, T₁ = 227°C

New temperature, T₂ =  27°C

We need to find the volume of gas occupied when the temperature is 27°C.

It is based on Charle's law. A/c to Charle's law,

[tex]V\propto T[/tex] (at constant pressure)

[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}\\\\V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{300\times 27}{227}\\\\V_2=35.68\ L[/tex]

Hence, the new volume is 35.68 L.

Suppose you mix Na2SO4 and KCl solutions according to the given equation.
Na2SO4 (aq) + 2 KCl(aq) + 2 NaCl(aq) + K2SO4 (aq)
What evidence of a reaction do you expect to see?
Select one:
A precipitate should form.
A gas should form.
Water should form.
Ο Ο
No reaction should occur.

Answers

Answer:

No reaction should occur

Explanation:

Water cannnot be made from the components

Nothing will be released as a gas

Both products are soluible in water therefore will not form a precipitate.

If I mix a solution of Na2SO4 and KCl, no reaction should occur.

Whether or not, a reaction occurs when two substances are mixed depends on the respective positions of the substances in the electrochemical series.

Now, we are expecting the reaction; Na2SO4 (aq) + 2 KCl(aq) + 2 NaCl(aq) + K2SO4 (aq) to occur. The big question is, between sodium and potassium, which is higher in the electrochemical series?

A little look into the image attached shows that potassium is higher than sodium in the series so the reaction is possible.

However, the both products are aqueous, they are both soluble in water hence no visible reaction occurs.

Learn more: https://brainly.com/question/24058474

A student read that a block has a density of .70g/cm^3. When she tested this she got .63g/cm^3. What is her percent error

Answers

Answer:

The answer is 10 %

Explanation:

The percentage error of a certain measurement can be found by using the formula

[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]

From the question

actual density = 0.7 g/cm³

error = 0.7 - 0.63 = 0.07

So we have

[tex]p(\%) = \frac{0.07}{0.7} \times 100 \\ = 10[/tex]

We have the final answer as

10%

Hope this helps you

what is one beneift of using scientific notation instead of regular notation

Answers

Answer:

its shorter than a regular one

Explanation:

the only reason is simply because it is shorter

How many valence electrons would be used in drawing the Lewis Structure CF4?

Answers

Answer:

32

Explanation:

You have 7 valance electrons in fluorine, and you have 4 of them. 7*4=28. Then, you have 4 valance electrons on carbon. So 28+4=32

It’s 32
Make it a brainliest answer

Which process occurs in a fission nuclear reactor?
Nuclei combine.
Nuclei split apart.
Neutrons combine.
Neutrons split apart.

Answers

Answer:

Nuclear fission/ split apart

Explanation:The process of splitting a nucleus is called nuclear fission and is used in nuclear power reactors. Fission is another word for splitting.

Hope this helps! brainlyeast would only be necessary if this helped you thanks! :) have a good day!

Answer:

The correct answer is B. Nuclei split apart

Explanation:

EDGE2022


Plzzzzz help me answer this question (WILL AWARD BRAINLIEST)

Answers

The correct answer is b

The table lists some compounds found in foods and their formulas.
Based on this information, which of these statements is NOT true?
CLEAR

Answers

Answer:

A

Explanation:

the number of molecule won't be twice as fructose has 12 hydrogen molecules and lactose has 22 hydrogen molecules

From the given statements, the statement saying that the number of atoms in Lactose is twice the number of atoms in Fructose is not correct. Thus option A is correct.

The given molecules in the list are Glutamine, Lactose, fructose, and Sorbitol.

The number of atoms in the following compounds is:

Glutamine = 20 atomsLactose = 45 atomsFructose = 24 atomsSorbitol = 26 atoms.

Statement A says that the number of atoms in Lactose is twice the number of atoms in Fructose. The twice atoms of Fructose are 48 atoms. The number of atoms of lactose is 45.

Thus statement A is incorrect. Thus option A is correct.

For more about the atoms in a molecule, refer to the link:

https://brainly.com/question/25617532

As the vibration of molecules increases, the _____ of the substance increases.

temperature

internal energy

kinetic energy

all of the above

Answers

Answer:

Answer option D- all of the above

are all physical reactions reversible?

A) No, while some such as freezing are, others, such as breaking glass aren't.

B) Yes, every single one of them are!

Answers

Answer: answer is A

Explanation:

What is the energy of a photon of red light having a frequency of 3.08 x 10^14 HZ?​

Answers

Answer:

2.04 x 10⁻¹⁹J

Explanation:

Given parameters:

  Frequency = 3.08 x 10¹⁴Hz

Unknown:

The energy of the photon  = ?

Solution:

 The energy of a photon is given as;

          E = hf

Where h is the planck's constant

            f is the frequency

Insert the parameters and solve;

           E = 6.63 x 10⁻³⁴ x 3.08 x 10¹⁴

          E = 20.4 x 10⁻³⁴⁺¹⁴

           E = 20.4 x 10⁻²⁰  = 2.04 x 10⁻¹⁹J

Answer:

2.97*10-19 j

Explanation:

E=Energy of photon

H=Planck constant=6.626*10-34

V=Frequency of photon

we can plug what we already know E=(6.626*10-34)(4.48*10 14)

The diagram shows a balloon that was rubbed with a piece of cloth what is the change

Answers

Answer: the electric charge

Explanation:

How many types of rocks can form from the rock cycle?
0 1
02
O 3
04

Answers

3 types of rocks. Sedimentary, igneous and metamorphic

Answer:

Sedimentary, igneous and metamorphic

Metomorphic, heat and pressure

Sedimentary erosion and weather

Igneous magma and lave

So three!

A reaction where heat is added is a(n)
endothermic reaction
heterogeneous reaction
reversible reaction

Answers

in endothermic reaction heat is added

which element has the largest atomic radii in the 3rd period of the periodic table?

Answers

Answer:

Sodium (Na)

Explanation:

PLEASE HELP ASAP! WILL MARK YOU AS BRAINLIEST!!!

Answers

Answer:

what are the options?

Explanation:

what is the difference between luster and dull

Answers

Explanation:

Luster means Shiny. Dull means simple and not full of detail. Hope this helps!Please Rate Brainiest!

-Aslina

Modeling Nuclear changes

Answers

Answer:

can someone please do this and put the answers below !!!!

Explanation:

How do changes in population size relate to environmental conditions?

Answers

Answer:

No simple relationship exists between population size and environmental change. However, as global population continues to grow, limits on such global resources as arable land, potable water, forests, and fisheries have come into sharper focus.

Explanation:

Hello. Is there certain answers or do you have to explain? I can try to explain as best as possible from my knowledge!

So, Population density is the average number of individuals per unit of area or volume. So as you know we use cars of a source of transportation and cars also cause pollution along with the people and factories this would mean that the amount of people could impact the environment based on how little or how much people are there as of the trash in the sea and much more and this may also harm our ozone layer that protects us from radiation cause to much sunlight leading to dryer areas less food and water etc. :) hope it helps!!

after felix adds salt to the boiling water what will he have in the pot

Answers

Answer:

Salty water

Explanation:

Sorry for wasting your time.

Cold-winter survival experts do not recommend eating snow for hydration. One reason for this is the energy it takes to increase temperature of the snow, melt it, and then increase the temperature of the resulting water to body temperature. Calculate the total amount of heat to convert 2.000 kg of snow at -15.00 0C to liquid water at 38.00 0C.

POTENTIALLY HELPFUL INFORMATION:
The heat of fusion for water is 1.44 kcal/mol.
The specific heat capacity of solid water is 0.488 cal/g0C.
The specific heat capacity of liquid water is 1.00 cal/g0C.
The freezing point of water is 00C (also known as melting point).

Answers

Answer:

The total amount of heat is 250.64 kcal.

Explanation:

Given that,

Total amount of heat = 2.000 kg

Temperature of snow = -15.00°C

Temperature of water = 38.00°C

Heat of fusion of water = 1.44 kcal/mol

Specific heat of solid water = 0.488 cal/g°C

Specific heat of liquid = 1.00 cal/g°C

We need to calculate the heat required to bring temperature -15°C to 0°C snow

Using formula of heat

[tex]Q_{1}=mc_{p}\Delta T[/tex]

Put the value into the formula

[tex]Q_{1}=2000\times0.488\times(0+15)[/tex]

[tex]Q_{1}=14640\ cal[/tex]

[tex]Q_{1}=14.640\ kcal[/tex]

We need to calculate the heat required to convert 0°C snow  into 0°C water

Using formula of heat

[tex]Q_{2}=ml[/tex]

Put the value into the formula

[tex]Q_{2}=\dfrac{2000}{18}\times1.44[/tex]

[tex]Q_{2}=160\ kcal[/tex]

We need to calculate  heat required to increases temperature of water from 0°C  to 38°C

Using formula of heat

[tex]Q_{3}=mc_{p}\Delta T[/tex]

Put the value into the formula

[tex]Q_{3}=2000\times1.00\times(38-0)[/tex]

[tex]Q_{3}=76000\ cal[/tex]

[tex]Q_{3}=76\ kcal[/tex]

We need to calculate the total heat

Using all heat amount

[tex]Q=Q_{1}+Q_{2}+Q_{3}[/tex]

Put the value into the formula

[tex]Q=14.640+160+76[/tex]

[tex]Q=250.64\ kcal[/tex]

Hence, The total amount of heat is 250.64 kcal.

Electro magnetic waves are blank waves

What’s the blank PLEASE HELP DUE IN 25 MINUTES!!!!

Answers

Answer:

Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. Hope it helps ;)

A lead ball has a mass of 5.910 g and a diameter of 10.0 mm. What is the density of lead in grams per cubic centimeter

Answers

Answer:

Explanation:

The formula is density = mass÷volume

Values given are:

mass = 5.910g  and

diameter = 10.0 mm = 1cm

so, we need to find the volume first.

Volume of a sphere is (4/3)πr³

thus, V = 4.189 cm³

Density = mass ÷ volume

density = 5.910 ÷ 4.189

= 1.411 g/cm³

6. Which of the following units would be MOST appropriate for measuring
the length of a car?*
1 poin
A. Millimeters
B. Centimeters
C. Meters
D. Kilometers
7. Which of the following units would be MOST appropriate for measuring
1 point

Answers

Answer:

Meter

Explanation:

Which of the following identifies the type of radiation that scientists most likely observed?
Radio
Infrared
Ultraviolet
Gamma Rays

Answers

Answer:gamma rays

Explanation:

Forecasting the weather for a specific area is relatively easy because of all the technology that is available.
A. True
B. False

Answers

Answer:

A

Explanation:

The answer is “A” true

Which molecule would have this shape?

Answers

Answer:

CO2

Explanation:

the subscript tells you how many of one element is used for this case there is one black atom and 2 red ones so you only need 1 carbon and 2 oxygens.

hope this helps. brainliest please?

What is the mass of 6.2x 1022 molecules of carbon monoxide?

Answers

Answer:

Mass = 2.8 g

Explanation:

Given data:

Number of molecules of CO = 6.2×10²²

Mass of CO = ?

Solution:

We will use Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

For given  6.2×10²² molecules of CO mass will be,

1 mole = 6.022 × 10²³ molecules of CO

6.2×10²² molecule × 1 mole/  6.022 × 10²³ molecules of CO

0.1 mol

Mass of CO:

Mass = number of moles  × molar mass

Mass = 0.1 mol  × 28 g/mol

Mass = 2.8 g

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