Question

1.Electron, proton,neutron are the types of .................. in an atom.
2.The electron shell.................. is nearest to the nucleus.
3.The electronic configuration of magnesium is 2,8,2. From this it is understood that the valence shell of Magnesium is .................. .

Answer 1

1. charged particles
2. k
3. -2

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Answer 2

(1) Sub-atomic Particles Presentbin an atom.

(2) K shell { or 1s orbital}

(3) valence elactrons are the last digit in Electronic configuration
So magnesium has 2 valence electrons in it valence shell and The Shell is M. Since M is the third Shell.

Hope it helps...
Regards,
Leukonov.