Atomic Structure Quiz

The outermost shell of an atom is called its:

• Nucleus

• Valence shell

• Inner shell

• Core

The electrons present in the outermost shell of an atom are called:

• Core electrons

• Neutrons

• Valence electrons

• Protons

An atom becomes positively charged (cation) when it:

• Gains electrons

• Loses electrons

• Gains protons

• Loses neutrons

Which of the following is a negatively charged ion?

• Na⁺

• Ca²⁺

• Cl⁻

• Mg²⁺

The valency of oxygen is:

• 1

• 2

• 4

• 8

According to the octet rule, atoms tend to have:

• 2 electrons in their valence shell

• 4 electrons in their valence shell

• 6 electrons in their valence shell

• 8 electrons in their valence shell

The duplet rule applies to:

• Hydrogen and Helium

• Lithium and Sodium

• Oxygen and Sulphur

• Chlorine and Fluorine

Sodium (Na, atomic number 11) has electronic configuration 2,8,1. Its valency is:

• 1

• 7

• 8

• 2

Chlorine (Cl, atomic number 17) has electronic configuration 2,8,7. Its valency is:

• 7

• 1

• 8

• 17

Which noble gas has a duplet configuration?

• Neon (Ne)

• Argon (Ar)

• Helium (He)

• Krypton (Kr)