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Amphoteric Reason As we move from left to right in periodic table, the basic character decreases and acidic character increases. Group 13 [IIIA] lies in the middle of the periodic…
Covalent Reason As the combining atoms i.e., S and O are non-metals and they both have high electron affinity hence they share two pairs of valence electrons in order to…
Argon Reason Electronic configuration of argon is 2, 8, 8 and so it's octet is complete and is stable and it does not form oxide.
Group 18 (Inert gases group) Reason The group 18 elements have 2 or 8 valence electrons and are stable elements hence have zero valency.
Metals present in period 3 are Na, Mg and Al. Non-metals present in period 2 are C, N, O and F.
One Reason Group number signifies the number of valence electrons of an element. Hence valency of group 1[1A] elements will be one.