The element be, mg, ca are placed in the second group of the periodic table. Their atomic numbers are 4, 12, 20 respectively. (a) write the electronic configuration of these elements. (b) write the valency exhibited by them. (c) which of the three elements will be most reactive?
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(a)be: - 2,2
mg: - 2,8,2
ca: - 2,8,8,2
(b) valency of be, mg and ca is 2
(c) can is most reactive
mg: - 2,8,2
ca: - 2,8,8,2
(b) valency of be, mg and ca is 2
(c) can is most reactive
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