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The position of three elements A, B and C in the Periodic Table are shown below:Giving reason, explain the following: (a) Element A is a metal. (b) Element C has a larger size than B. (c) Element B has a valency of 3. |
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Answer» (a) ‘A’ is a metal because its valence electron is 1, it can readily loose electron to became stable. (b) Element ‘C’ belongs to 3rd period it has 3 shells whereas ‘B’ has only 2 shells, it belongs to 2nd period, distance between nucleus and valence electrons is more in C, hence its size is bigger than B. (c) ‘B’ belongs to III group, has 3 valence electrons, it can loose 3 electrons to become stable hence its valency is 3. |
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