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The electron configuration of element Y is 1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\)3P\(^4\). Y, therefore,

Chemistry
WAEC 2025

The electron configuration of element Y is 1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\)3P\(^4\). Y, therefore,

  • A. has mass number of 16
  • B. has three unpaired electron
  • C. belongs to period 4
  • D. belongs to group VI
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Correct Answer: Option D
Explanation

The atomic number (Z) is equal to the total number of electrons in a neutral atom. By summing the exponents in the electron configuration: 2+2+6+2+4 = 16

An atomic number of 16 identifies the element as Sulphur (S). Element Y belongs to group VI because it has six electrons in its outermost shell.

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