Group I and II elements

Magnesium and calcium have similar chemical properties because their atoms have the same

• electronic arrangement.

• atomic structure.

• number of electron shells.

• number of outermost shell electrons.

Which of the following statements concerning Group I elements are INCORRECT?

(1) All of them are hard.

(2) All of them react with water.

(3) The number of outermost shell electrons in their atoms increases down the group.

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Strontium(group II) is an element below calcium(group II) in the Periodic Table. Which of the following statements concerning strontium are correct?

(1) It reacts with oxygen to form an ionic compound.

(2) It reacts with water less vigorously than calcium does.

(3) It is a solid at room temperature and pressure.

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

The alkaline earth metals have ___electrons in the outermost shell in their atoms. They are in Group II of the Periodic Table. Reactivity of these elements _________down the group.

The alkali metals have ___electron in the outermost shell in their atoms. They are in Group I of the Periodic Table. Reactivity of these elements _________ down the group.