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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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3.Write the symbol of the element that has a charge of +1 when it has 71 electrons.

tigry1 [53]

The symbol : $\tt _{72}^{178}Hf^{+1}$

<h3>Further explanation </h3>

There are two components that accompany an element, the mass number and atomic number

Atoms are composed of 3 types of basic particles (subatomic particles): <em>protons, electrons, and neutrons </em>

The Atomic Number (Z) indicates the number of protons and electrons in an atom of an element.

Atomic number = number of protons = number of electrons ⇒ neutral number

Atomic mass is the sum of protons and neutrons

Atomic Number (Z) = Atomic mass (A) - Number of Neutrons

The element has 71 electrons and a charge of +1 , so

Number of protons = 71 + 1 = 72

Number of protons = the atomic number = 72

The element with atomic number 72 is Hafnium(Hf)

The atomic mass of Hf = 178 g/mol

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3 years ago

List any three quantum numbers that describe an electron in an atom and state the relationship between any of the two

Licemer1 [7]

Explanation:

To completely describe an electron in an atom, four quantum numbers are needed: energy (n), angular momentum (ℓ), magnetic moment (mℓ), and spin (ms).

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3 years ago

What three human body systems coordinate cause an arm to move

tia_tia [17]

(A) nervous, muscular, skeletal

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3 years ago

What are thermal plasmas?

vitfil [10]

<span>plasmas that reach a temperature equal to their surroundings

----------------------=0uyjgyhjngytfgbhtfgbdc b gdf gb </span>

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3 years ago

Read 2 more answers

A salt crystal has a mass 0.14mg,How many NaCl formula units does it contain?

klemol [59]

To determine the number of formula units in a sample of a compound you need to divide the number of grams by the formula mass. The formula mass of NaCl is 23 g/mol + 35.5 g/mol = 58.5 g/mol, and the number of grams of the sample is 0.14 mg * 1 g/ 1000 mg = 0.00014 g. Then the answer is 0.00014 g / 58.5 g = 2.30 * 10^ -6, which rounded to two significant figures is 2.4 * 10^ -6. So<span> the answer is 2.4 * 10^-6 or 0.0000024</span>

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3 years ago