Ionic Bonding Quiz 1

The following shows the chemical symbol of a sodium atom. Select the statements that are true of a sodium atom.

• It has 11 protons.

• It has 12 protons.

• It has 11 neutrons.

• It has 12 neutrons.

• It has 11 electrons.

Answer explanation

As an atom is electrically neutral, the number of protons is equal to the number of electrons.

What is the electronic configuration of sodium atom?

• 2, 1

• 2, 8

• 2, 8, 1

• 2, 8, 2

Which statement correctly describes the formation of sodium ion from a sodium atom?

• Sodium atom loses one electron to form Na⁺ ion.

• Sodium atom gains one electron to form Na^- ion.

• Sodium atom loses one electron to form Na^- ion.

• Sodium atom gains one electron to form Na⁺ ion.

Answer explanation

Sodium atom needs to lose one electron to obtain the stable configuration of noble gas.

The electronic configuration of an oxygen atom is 2, 6. Which statement correctly describes the formation of an oxide ion?

• It gains two electrons to form O²⁺ ion.

• It gains two electrons to form O^2- ion.

• It loses six electrons to form O^2- ion.

• It loses six electrons to form O⁶⁺ ion.

Answer explanation

Oxygen atom has 8 electrons. After gaining 10 electrons, the ion has an overall charge of 2-.

Which statements correctly describe the formation of ionic bonds between sodium and oxygen?

• Two sodium atoms, each gains one electron from an oxygen atom to form sodium ions.

• Two sodium atoms, each loses one electron to an oxygen atom to form sodium ions.

• One oxygen atom loses two electrons to two sodium atoms to form oxide ion.

• One oxygen atom gains two electrons from two sodium atoms to form oxide ion.