Chemistry
WAEC 2017
The reason for the decrease in the atomic size of elements across a period is that
-
A.
nuclear charge increases while the outermost electrons are drawn closer to the nucleus
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B.
nuclear charge decreases while the outermost electrons are drawn closer to the nucleus
-
C.
valence electrons increase across the period while the valence shell remains constant
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D.
nuclear charge decreases while the distance of the valence shell from the nucleus is increasing
Correct Answer: Option A
Explanation
This is caused by the increase in the number of protons and electrons across a period.
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