Question

Q) Find the trends in modern periodic table on the basis of
A)Number of valence electrons in first group and third period.
B)Valency in second group and fourth period.
C)Atomic size of fourth group and fourth period.
D)Metallic caracter in fifth group and in fifth period.
E)Chemical reactivity along groups and in periods.
F)Nature of oxides(Basic nature and acidic nature) along periods and groups.
G)Non-metallic characters in groups and in periods.​

Answer 1

Explanation:

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.

Answer 2

Explanation:

A) valence electrons = 1

Third period the number of valence electrons increases from left to right.

B) valency=2

Fourth period the valency increases from left to right.

C) the atomic size of the group increases down the group and the atomic size of the period decreases from left to right.

D) metallic character increases down the group and decrease across the period.

E) same as D)

F) depend on metal or non metal. Metals are basic and non metals are acidic.

G) opposite answer as D)

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