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The reason for the decrease in the atomic size of elements across a period is...

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
  • 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
  • D. nuclear charge decreases while the distance of the valence shell from the nucleus is increasing
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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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