MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
How many electrons are in the outer shell of the alkali metals?
Think it through first, then pick an option.
- a 1
- b 2
- c 3
- d 4
Answer and explanation
Correct answer: a 1
Alkali metals have one outer electron (ns¹).
Why the other options are wrong
- b 2: Alkaline earth metals have two. The answer is 1.
- c 3: Group 13 has three. The answer is 1: alkali metals have one outer electron (ns¹).
- d 4: Group 14 has four. The answer is 1: alkali metals have one outer electron (ns¹).
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