Question

An atom of an element ‘X’ has 2 electrons in its N shell.

1) State its electronic configuration
2)is it a metal or a non-metal?
3)state the number of X.
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Answer 1

Explanation:

Solution :

(a) since the atom has two electrons in outermost M lshell this means that K and L shells are already filled . <br> Therefore electronic configuration is 2(K)8(L)2(M) <br> (b) Number of protons =Number of electrons =12 <br> (c ) Atomic number = Number of proton s=12 <br> (d) The element with two valence electrons is a metal <br> (e ) valency of the elemebnt = Number of outermost electrons =2 <br> (f) The element is mechanesium