Atomic Theory Review

How many electrons are there in the third shell (principal energy level) of the atom with atomic number 23?

• 8

• 13

• 11

• 10

• 3

How many electrons are there in the “p” orbitals of the last shell (principal energy level) of silicon, atomic number 14?

• 2

• 0

• 4

• 1

• 3

A lithium atom has an atomic number of 3 and a mass of 7 a.m.u. The number of electrons which it has in the second shell (principal energy level) is ______.

• 0

• 1

• 2

• 3

The characteristic light spectrum of an element is produced when _____.

• electrons are emitted by an atom

• electrons are raised to higher energy levels

• the energy level of the nucleus is increased

• electrons drop back to lower energy levels

Choose the electron arrangement that is possible. (for a ground state)

• 1 electron in Level 1 and 8

  electrons in Level 2.

• 2 electrons in Level 1 and 8 electrons in Level 2

• 8 electrons in Level 1 and 8 electrons in Level 2.

• 8 electrons in Level 1 and 2

  electrons in Level 2.

• None are possible

The number of “p” electrons in the highest principal energy level of ₁₆S is

• 4

• 8

• 3

• 6

• 2

In the ground state, Al and Mg atoms both have the same number of electrons in the _______.

• 3rd energy level

• outmost energy level

• 3p sublevel

• 3s sublevel

What is the total number of principal energy levels that are completely filled in an atom of calcium in the ground state?

• 5

• 4

• 1

• 2

• 3

How many orbitals are completely filled in an atom of phosphorus in the ground state?

• 9

• 6

• 12

• 15

• None of these

How many occupied sublevels are in the atom of potassium in the ground state?

• 4

• 6

• 10

• 0