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3 years ago

What makes the atomic radius change down a column of the periodic table

2 answers:

8 0

As you go across a period, radius shrinks because you are adding protons. The added positive charge increases pull on the electron shells.

As you go down a group, radius gets larger because you are increasing shells of electrons. This increases shielding of the nucleus' positive charge, so the electrons are not pulled in as much.

PtichkaEL [24]3 years ago

4 0

Explanation:

When we move down a group then there is increase in the size of elements because there occurs increase in atomic mass of the elements.

It means that there occurs increase in number of electrons due to which there will be increase in number of new shells. As a result, size of atom or element increases due to which there is increase in atomic radius of the element.

Therefore, we can conclude that increase in number of electrons makes the atomic radius change down a column of the periodic table.

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Mercury can be obtained by reacting mercury(II) sulfide with

givi [52]

Answer:

111.68 g

Explanation:

Given data:

Mass of HgS needed = ?

Mass of CaS produced = 26.0 g

Solution:

Chemical equation;

4HgS + 4CaO → 4Hg + 3CaS + CaSO₄

Number of moles of CaS:

Number of moles = mass/molar mass

Number of moles = 26 g/ 72.143 g/mol

Number of moles = 0.36 mol

Now we will compare the moles of HgS with CaS.

CaS : HgS

3 : 4

0.36 : 4/3×0.36 = 0.48 mol

Mass of HgS:

Mass = number of moles × molar mass

Mass = 0.48 mol × 232.66 g/mol

Mass = 111.68 g

6 0

3 years ago

The scientist finds fossilized remains of other species in the same rock layer as the trilobite. What can the scientist conclude

Sophie [7]

The Organisms that formed them likely lived during the Paleozoic era.

4 0

3 years ago

How do I find the correct answer for this chemistry question

horsena [70]

Answer:

letter C. Solid iron and chlorine gas react to produce solid iron (lll) chloride

Explanation:

i hope it helps

6 0

3 years ago

If the molar mass of x (hco3) is 162 g/mol, determine the relative atomic mass of x.

Anastasy [175]

The relative atomic mass of x is 101 u.

Molar mass is calculated by adding the atomic mass of all the elements in a compound.

Molar mass of x(HCO₃) =162 g/mol

Atomic mass of H = 1 g/mol

Atomic mass of C =12 g/mol

Atomic mass of O = 16 g/mol

Therefore, molar mass of x(HCO₃) will be

= x + 1 + 12 + 3 x 16

We know that:

x + 1 + 12 + 3 x 16=162

x + 61 = 162

x = 101 g/mol

The relative atomic mass of x will be 101 u.

Learn more about molar mass here:

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7 0

3 years ago

Which characteristic of atoms is the basis for the order on the Periodic Table?

il63 [147K]

The answer is c atomic number

3 0

3 years ago

Read 2 more answers