Examples of elements belonging to s,p,d or f− block are given below. Identify the wrong example.
A
s−block element - Caesium
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B
p−block element - Barium
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C
d−block element - Chromium
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D
f−block element - Thorium
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Solution
The correct option is Ap−block element - Barium Barium is s−block element. It is alkaline earth metal. It belongs to group IIA and has valence shell electronic configuration of 6s2.