the element be,mg,ca placed in the second group of periodic table their atomic size are 4,12,20 respectively. 1. write the electronic configuration. 2. write the valency exhibited by them. 3. which of 3 elements will be more reactive (size, nuclear charge).
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1s2 2s2
1s2 2s2 2p6 3s2
1s2 2s2 2p5 3s2 3p6 4s2
1s2 2s2 2p6 3s2
1s2 2s2 2p5 3s2 3p6 4s2
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Be: electronic configuration:1s² 2s²
valency :2
Mg: electronic configuration:1s² 2s² 2p6 3s²
valency:2
Ca: electronic configuration:1s2 2s2 2p6 3s2 3p6 4S2
valency:2
valency :2
Mg: electronic configuration:1s² 2s² 2p6 3s²
valency:2
Ca: electronic configuration:1s2 2s2 2p6 3s2 3p6 4S2
valency:2
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