Q: Which formula correctly calculates the number of inner core electrons for a main group element?

$$\text{Inner Core Electrons} = Z - \text{Valence Electrons}$$

Question 1

Which of the following best describes valence electrons in main group elements?

Accepted Answer

Electrons involved in forming chemical bonds.

Question 2

A chlorine atom (Group 7A, $$Z = 17) $$has how many valence electrons?

Accepted Answer

$$7$$

Question 3

How many inner core electrons does a silicon atom ($$Z = 14) $$possess?

Accepted Answer

$$10$$

Question 4

If an atom of carbon ($$Z = 6) is $$considered, how many valence electrons does it have?

Accepted Answer

$$4$$

Question 5

Which formula correctly calculates the number of inner core electrons for a main group element?

Accepted Answer

$$	ext{Inner Core Electrons} = Z - 	ext{Valence Electrons}$$

Question 6

A nitrogen atom ($$Z = 7) $$belongs to Group 5A. How many inner core electrons does it have?

Accepted Answer

$$2$$

Question 7

Which of the following statements about core electrons is correct?

Accepted Answer

Core electrons do not participate in chemical bonding.

Question 8

An oxygen atom ($$Z = 8) is in $$Group 6A. How many valence electrons does it have?

Accepted Answer

$$6$$

Question 9

Which element would have the greatest number of inner core electrons: carbon ($$Z = 6$$), nitrogen ($$Z = 7$$), or oxygen ($$Z = 8$$)?

Accepted Answer

Oxygen

Question 10

A student claims that the number of valence electrons for an element in Group 2A is $$2. $$Which of the following elements supports this claim?

Accepted Answer

Magnesium ($$Z = 12)$$

Question 11

If a main group element has $$Z = 15$$ and is in Group 5A, how many inner core electrons does it have?

Accepted Answer

$$10$$

Question 12

Which of the following is a correct statement about the relationship between atomic number ($$Z$$), valence electrons, and inner core electrons for main group elements?

Accepted Answer

The sum of valence electrons and inner core electrons equals the atomic number.

Question 13

A fluorine atom ($$Z = 9) is in $$Group 7A. How many inner core electrons does it have?

Accepted Answer

$$2$$

Question 14

Which of the following elements has the same number of valence electrons as chlorine?

Accepted Answer

Bromine

Question 15

A student is asked to find the number of inner core electrons in a phosphorus atom ($$Z = 15$$, Group 5A). What is the correct calculation?

Accepted Answer

$$15 - 5 = 10$$

Question 16

Which of the following is NOT a property of valence electrons?

Accepted Answer

They are always paired in the atom.

Question 17

If an element is in Group 1A, what is the number of valence electrons it possesses?

Accepted Answer

$$1$$

Question 18

Which of the following elements has $$2$$ inner core electrons and $$5$$ valence electrons?

Accepted Answer

Nitrogen ($$Z = 7)$$

Question 19

A student is analyzing the electron arrangement of chlorine. Which statement is correct?

Accepted Answer

Chlorine has $$7$$ valence electrons and $$10$$ inner core electrons.

Valence and Core Electrons in Main Group Elements

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