Consider the following elements : Be, Li, Na, Ca, K.Name the elements of (a) same group (b) same period.

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Solution

(a) Same IA group (Li, Na, K) and IIA group (Be, Ca)
(b) In the second period (Be, Li) and in the fourth period (K, Ca)

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Number of Elements in a Period

Standard X Chemistry

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Consider the following elements : Be, Li, Na, Ca, K.Name the elements of (a) same group (b) same period.

﻿ (a) Same IA group (Li, Na, K) and IIA group (Be, Ca) (b) In the second period (Be, Li) and in the fourth period (K, Ca)

(a) Same IA group (Li, Na, K) and IIA group (Be, Ca)
(b) In the second period (Be, Li) and in the fourth period (K, Ca)