Q 01/05

What is the chemical symbol for lithium?

A) Lm

B) Li

C) Lt

D) L

Answer · why

B) Li

Its atomic number is 3.

Q 02/05

What is lithium's atomic number?

A) 3

B) 5

C) 7

D) 11

Answer · why

A) 3

Only hydrogen and helium are lighter.

Q 03/05

The name lithium comes from the Greek word for what?

A) Stone

B) Light

C) Fire

D) Salt

Answer · why

A) Stone

Berzelius chose it because the element was found in a solid mineral, unlike potassium (plant ash) or sodium (animal blood).

Q 04/05

Lithium holds which record among all metals under standard conditions?

A) Best conductor

B) Least dense

C) Hardest

D) Highest melting point

Answer · why

B) Least dense

It is also the least dense solid element.

Q 05/05

Lithium is one of only three metals that can float on water. What are the other two?

A) Sodium and potassium

B) Calcium and beryllium

C) Rubidium and caesium

D) Aluminium and magnesium

Answer · why

A) Sodium and potassium

It can even float on the lightest hydrocarbon oils.