Asked by sweetynam | 18th Feb, 2009, 11:27: PM

Expert Answer:

a)The element having a single electron in its outermost shell as per electronic structure will be the 1st element of a period.

b) The element with a competely filled last shell will be the terminating member of a period.

c)Chemically similar element generally have simlar configuations of the valence shell.

Answered by  | 19th Feb, 2009, 12:47: AM

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