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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom3 Marks
Question
An atom X has 4 protons and 5 neutrons with electronic configuration 2, 2. Give information about its.
  1. Atomic number.
  2. Mass number.
  3. Valency.
✓

Answer

Protons = 4

Neutrons = 5

Number of protons = Number of electrons

Number of electrons = 4

Electronic Configuration
= 2, 2

Number of Valence electrons in the outermost shell = 2
Valency = 2

  1. Since, protons =electrons = atomic no. 

So atomic no. is 4

  1. Mass Number = No. of Protons + No. of Neutrons

= 4 + 5 = 9

  1. Now electronic distribution, K = 2, L = 2

So as the outermost shell has 2 electrons, so the valency will be 2

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