Question

Compare and contrast the elements present in the modern periodic table down the group and across a period with respect to
a. Atomic size
b. Valencies
c. Metallic character
d. Number of shells
e. Non metallic character.​

Answer 1

Answer:

Answer

There are 7 periods in the modern periodic table.

Metallic character tends to decrease on going across a period whereas the number of valence electrons increases in a period and valency first increases from 1 to 4 and then decreases from 4 to 0.

Atomic radius increases from top to bottom within a group. This is caused by the addition of a new shell. In a group, the number of valence electrons does not change. Hence, all the elements of one group have the same valency.

Explanation:

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