
Concept explainers
Interpretation:
Barium needs to be classified according to group, period, and block in the periodic table.
Concept introduction:
A periodic table consists of groups and periods. The horizontal rows are termed as periods and the vertical columns are termed as groups. The elements with similar properties are placed together in a group. The elements are also located according to different blocks like s, p, d, f blocks.

Answer to Problem 54A
Barium is located in group 2 in the s-block and on the 6th period.
Explanation of Solution
Barium is located in group 2 in the s-block and on the 6th period. So, the electronic configuration of Barium is given as 1s22s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p66s2 and the noble as configuration for Barium is [Xe]6s2
The element Barium is located on the s-block in group 2 and on the 6th period.
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