Question

7) a) How many groups and periods are there in the modern period table ?How do the atomic size
and metallic character of elements vary as we move?
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Answer 1

Answer:

There are 7 periods and 18 groups in the modern periodic table. Metallic character decreases from left to right across a period because as atomic size goes on decreasing so tendency to lose electrons decreases.

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Answer 2

Explanation:

There are 7 periods and 18 groups in the modern periodic table.

1. On moving from left to right in a periodic table, the metallic character of elements decreases.

Metals have a tendency to lose electrons. In a period, atomic size decreases so it becomes difficult to remove the electrons of the outermost shell.

2. On moving from top to bottom in a periodic table, the metallic character of element increases.

As we move down the group, atomic size increases so the electron of the outermost shell is easy to remove and hence metallic character of the element increases.