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Which of the following statements is correct about the periodic table

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CHEMISTRY

Which of the following statements is correct about the periodic table?

A. Elements in the same period have the same number of valence electrons

B. The valence electrons of the elements in the same period increase progressively across the period

C. Elements in the same group have the same number of electron shells

D. The non-metallic properties of the elements tend to decrease across each period

QUICK ANSWER…

B

SOLUTION 

The periodic table is an orderly arrangement of elements from left to right across a period or row, and from top to bottom down a group or column according to their progressive atomic numbers.

Now for the right answer to the above question:

  1. Option A is incorrect. elements in the same period have the same shell, but different number of valence electrons. Their valence electrons progressively increase by one from left to right.
  2. Option B is correct. Yes, the valence electron of elements in the same period increases progressively by one as we move from left to right.
  3. C is incorrect. No, elements in the same group have the same number of valence electrons and not the same number of shells.
  4. D is not the correct answer. The non-metallic properties of elements actually increase as we move from left to right across the period.

QUICK TIPS…

You may please note these/this:

  • Number of valence electrons remains the same within a group, but increases progressively by one as we move from left to right across the period.
  • Number of shells remains the same within a period, but increases progressively by one as we move from top to bottom down a group.

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/ culled from 2018 JAMB-UTME Chemistry question 7 /

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