6. Li, Be, B, 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 last electron enter for all of them.
c. Calculate the valence electrons in each.
d. Which element amongst them is most electropositive?

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Solution

Dear student
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, Be =2, B =3 and C=4

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

Regards

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Dear student 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, Be =2, B =3 and C=4 d. Li as electropositive character decreases on moving across a period. Regards

Dear student
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, Be =2, B =3 and C=4

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

Regards