Li- Be- B and c are the elements of same period of modern periodic table-a- arrange them in increasing order of their atomic size -8203-b- in which shell-number- would the last electron enter for all of them -c- calculate the number of valence electron in each-d- which element amongst them is most electropositive

A. Atomic size decreases on moving from left to eight across a period. so, Li nbsp; gt; Be gt; B gt;C b. L or 2nd shell c. Li = 1, e=2, B =3 and C=4 ...

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Standard IX

Chemistry

Groups in Modern Periodic Table

Li, Be, B and...

Question

Li, Be, B and c are the elements of same period of modern periodic table.
(a) arrange them in increasing order of their atomic size
(b) in which shell(number) would the last electron enter for all of them ?
(c) calculate the number of valence electron in each.
(d) which element amongst them is most electropositive

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Solution

a. Atomic size decreases on moving from left to eight across a period. so, Li > Be> B >C

b. L or 2^nd shell

c. Li = 1, e=2, B =3 and C=4

d. Li as electropositive character decreases on moving across a period.

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a. Atomic size decreases on moving from left to eight across a period. so, Li > Be> B >C b. L or 2nd shell c. Li = 1, e=2, B =3 and C=4 d. Li as electropositive character decreases on moving across a period.

a. Atomic size decreases on moving from left to eight across a period. so, Li > Be> B >C

b. L or 2^nd shell

c. Li = 1, e=2, B =3 and C=4

d. Li as electropositive character decreases on moving across a period.