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The electronic configurations of X and Y are 1s2 2s2 2p6 3s1 and 1s2 2s2 2p4 respectively.Then:

(a) Which atom can form an anion?Why?

(b)Which atom can form the cation?Why?

(c)The X,Y elements belong to which blocks of periodic table?

(d)Write the formula of the compound formed due to chemical bond between X and Y atoms.



X is 1s2 2s2 2p6 3s1
Y is 1s2 2s2 2p4

a) Y can for anion because it can accept 2 electrons in its 2p orbital. The anion formed will have charge -2.

b) X can form cation as it can loose 1 electron from its outermost 3s orbital. The cation formed will have charge +1.

c) X belongs to 1 group, 3rd period (X is sodium, Z=11)
Y belongs to 16th group, 2nd peiod (Y is oxygen, Z=8)

d) The formula of compound will be X₂Y.
2 5 2
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