Understanding Valency and Valence Electrons

What is the main difference between valency and valence electrons?

• Valency is the number of neutrons, valence electrons are the number of protons.

• Valency is the charge after bonding, valence electrons are the outer electrons before bonding.

• Valency is the number of protons, valence electrons are the number of neutrons.

• Valency is the number of electrons in the first shell, valence electrons are in the last shell.

How many valence electrons does lithium have?

• Two

• Three

• One

• Four

What happens to lithium's electron configuration during bonding?

• It loses one electron.

• It gains two electrons.

• It loses two electrons.

• It gains one electron.

What is the valency of lithium after it loses an electron?

• +1

• -1

• +2

• -2

How many valence electrons does oxygen have?

• Eight

• Four

• Six

• Two

What is the valency of oxygen after it gains electrons?

• -2

• +2

• +1

• -1

Which group number corresponds to the number of valence electrons?

• Group number is equal to the number of valence electrons.

• Group number is always one less than valence electrons.

• Group number is unrelated to valence electrons.

• Group number is always one more than valence electrons.

What is the valency of fluorine?

• -1

• -2

• +1

• +2

How many valence electrons does sulfur have?

• Six

• Four

• Two

• Eight

What is the valency of aluminum?

• +2

• -3

• +3

• -2