Which of the following statements is correct ab... - JAMB Chemistry 2016 Question
Which of the following statements is correct about the periodic table?
A
Elements in the same group have the same number of electron shells
B
The non-metallic properties of the elements tend to decrease across each period
C
Elements in the same period have the same number of valence electrons
D
The valence electrons of the elements increase progressively across the period
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Correct Option: D
- A. Elements in the same group (vertical column) have the same number of valence electrons, not the same number of electron shells. The number of electron shells increases as you go down a group.
- B. Non-metallic properties increase across a period (from left to right).
- C. Elements in the same period (horizontal row) have the same number of electron shells, not the same number of valence electrons. Valence electrons increase across a period.
- D. The valence electrons of the elements increase progressively across the period. This is the correct statement because as you move across a period from left to right, the number of valence electrons increases.
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