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Groups in Modern Periodic Table

Three element...

Question

Question 33
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.

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Solution

Group 2 has 2 electrons in their outermost shell and has a valency of 2. Group 13 has 3 electrons in their valence shell and has a valency of 3 and group 14 has 4 valence electrons and has a valency of 4.

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Groups in Modern Periodic Table

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