The element of 3rd Period of the periodic table are given along na,mg,Al,si,p,s,cl and which is more non metallic s and cl and which has higher atomic mass Al and cl
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Cl is more non metallic than S and Cl has higher atomic mass than Al
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(a) Na atom is bigger in size because as we move from Na to Cl, the atomic number goes on increasing and the nuclear charge also increases. It pulls/ attract the valence electrons at the centre more efficiently and thus the atomic size decreases.
(b) (i) Most metallic - Na
(ii) Most non-metallic - Cl
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