Question

Two elements are represented as 17x35 and 12y24.
a) Which of these elements will lose electronic and gain electronic.
b) What is the number of electrons an atom loses, gain or share called?
c) Write electronic configuration of X and Y. ​

Answer 1

Answer:

a) Element X can gain electron easily, Y can lose electron easily.

b) Valency

c) E.C of X (Z= 17) : 1s^2 2s^2 2p^6 3s^2 3p^5

E.C of Y (Z= 12) : 1s^2 2s^2 2p^6 3s^2

Explanation:

By solving the question (c) first, we can solve other questions easily. The ultimate aim if to provide the answer, right?

c) I don't think this needs explanation. Apply Aufbau Rule, one can write E.C easily. So,

E.C of X (Z= 17) : 1s^2 2s^2 2p^6 3s^2 3p^5

E.C of Y (Z= 12) : 1s^2 2s^2 2p^6 3s^2

So coming to the question (a),

The stability of the atom can be achieved by noble gas configuration, i.e. the valence shell must contain 8 electrons, the element X can gain 1 electrons to get an octet in M shell and Y can lose 2 electrons to get an octet in L shell.

b) The electrons which take part in bonding is known as bond electrons. These are nothing but valence electrons of elements which take part in chemical bonding. Though there is a difference between bond electrons and valency, in moisture chemical bond formations the no.of valence electrons = no.of bond electrons contributed by single atom. Hence no.of bond electrons is also called as valency.

Hope this helps.

PS: Octet rule cannot be applicable to certain molecules and the answer for (a) does not mean that element X can not lose electrons, it may lose at certain conditions.