Question

Examine the false statement.
The alkali earth metals have five valence electrons.
Select the rewording of the statement that is true.
The alkali earth metals have one valence electron.
The alkali earth metals have two valence electrons.
The halogens have five valence electrons.
The alkali metals have five valence electrons.

Answer 1

The alkali earth metals have two valence electrons.
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Answer 2

Answer:

The alkali earth metals have one valence electron.

Explanation:

Alkali earth metals are elements that constitute Group I in the periodic table. These include: lithium (Li),  sodium (Na), potassium (K), rubidium (Rb), cesium (Cs) and francium (Fr).

The alkali earth  metals are characterised by a outer or valence electron configuration of ns¹.

Li = 2s¹, Na = 3s¹, K = 4s¹, Rb = 5s¹, Cs = 6s¹

Therefore, in their outermost or valence shell these elements have only one  electron.

Hence the given statement: that the alkali earth metals have 5 valence electrons is false. Instead it should be reworded as:

The alkali earth metals have one valence electron.