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Question

Which of the following is the incorrect set of atomic number and valency?

A
Sodium: atomic number-11, valency-1
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B
Nitrogen: atomic number-7, valency-1
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C
Magnesium: atomic number-12, valency-2
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D
Carbon: atomic number-6, valency-4
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Solution

The correct option is B Nitrogen: atomic number-7, valency-1
Atomic number is the number of protons present in the nucleus of an atom.

For a neutral atom, number of protons is equal to the number of electrons. Valency can be calculated from a short-cut method as given below.
  1. If valence electrons are four or less, valency = number of valence electrons
  2. If valence electrons are more than four, valency = 8-valence electrons
ElementAtomic no.Electronic configurationValencySodium 112,8,11Nitrogen72, 5(8-5)=3Magnesium122,8,22Carbon62,44Hence, valency of nitrogen is 3 and not 1.

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