Understanding Valence Electrons and Valency

What are valence electrons?

• Neutrons in the nucleus

• Protons in the nucleus

• Electrons in the outermost shell

• Electrons in the innermost shell

Which of the following elements is considered inert due to a full outer shell?

• Helium

• Lithium

• Hydrogen

• Sodium

How is the valency of an atom determined?

• By the number of unfilled electrons in the outermost shell

• By the number of neutrons in the nucleus

• By the total number of electrons in the atom

• By the number of protons in the nucleus

What happens when an atom like fluorine, with seven electrons in its outer shell, achieves an octet?

• It gains seven electrons

• It loses seven electrons

• It gains one electron

• It shares seven electrons

Which of the following elements has a valency of one due to having one electron in its outermost shell?

• Argon

• Helium

• Neon

• Hydrogen