Question

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

Answer 1

Elements of same group are :
Be, Ca
Be - Beryllium
Ca - Calcium
Elements of same period are :
Be, Li
Be - Beryllium
Li - Lithium

Answer 2

The elements (Be, Li) were same period.

The elements (Be, Ca) were same group.

Explanation:

• The columns in the period table are considered as the groups and the rows in the periodic table are considered as periods.

• Totally there are 7 periods and 18 groups in the periodic table but these 18 groups are 8 groups of sub-divisions of A and B. The group 8B have three columns.

• The elements which lie in the same column are said to be the elements of that particular group and those which lie in the same row are said to be the elements of that particular period.

• In the given elements Be, Li lies in Period-2, Na lies in Period-3 and Ca, K lies in Period-4 and Be, Ca lies in Group-2A, Li, Na, K lies in Group-1A.

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