Question
An atom X has 4 protons and 5 neutrons with electronic configuration 2, 2. Give information about its.
- Atomic number.
- Mass number.
- Valency.
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
So atomic no. is 4
= 4 + 5 = 9
So as the outermost shell has 2 electrons, so the valency will be 2
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