Question 1

Which of the following best describes the electron arrangement for an atom of sodium (Na, Z = 11)?

Accepted Answer

$$2-8-1$$

Question 2

What is the maximum number of electrons that can occupy the second energy level of an atom?

Accepted Answer

$$8$$

Question 3

Given the electron arrangement $$2-8-6$$, which element does this correspond to?

Accepted Answer

Sulfur (S)

Question 4

Which statement about energy levels and electron arrangements is correct?

Accepted Answer

The energy level (shell number) of an atom can be identified by the period number on the periodic table.

Question 5

Which of the following electron arrangements represents an atom in Group 2A of the periodic table?

Accepted Answer

$$2-8-2$$

Question 6

If an atom has the electron arrangement $$2-8-8-2$$, what is its atomic number and which element is it?

Accepted Answer

Calcium (Ca), $$Z = 20$$

Question 7

Which of the following is true regarding the filling of electrons in energy levels?

Accepted Answer

Electrons fill the lowest available energy levels first before moving to higher levels.

Question 8

A neutral atom has the electron arrangement $$2-8-7. $$Which group and period does this element belong to?

Accepted Answer

Group 7A, Period 3

Question 9

Which of the following elements has a completely filled second energy level?

Accepted Answer

Neon (Ne)

Question 10

Why do elements in the same group of the periodic table have similar chemical properties?

Accepted Answer

They have the same number of electrons in their outermost energy level.

Question 11

Which electron arrangement would you expect for an element in Group 1A, Period 2?

Accepted Answer

$$2-1$$

Question 12

A patient is exposed to a new element with the electron arrangement $$2-8-8-1. $$Predict one chemical property this element is likely to have.

Accepted Answer

It is highly reactive and likely to lose one electron to form a $$+1$$ ion.

Question 13

Which of the following best explains why the energy required to remove an electron increases as you move from the first to the second energy level?

Accepted Answer

Electrons in the first energy level are closer to the nucleus and more strongly attracted.

Electron Arrangements and the Periodic Table

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