Write the number of periods and groups in the Modern Periodic Table.
How does the metallic character of elements vary on moving (i) from left
to right in a period, and (ii) down a group ? Give reason to justify your
answer.
Answers
HERE IS YOUR ANSWER:--
there are 8 periods and 18 groups in modern periodic table
1)on going from left to right in a period,the metallic character decrease.
2) on going down in a group,the metallic character increase.
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Total no. Of horizontal rows , known as periods in the modern periodic table ::- 7 periods .
Total no. Of vertical columns , known as groups in the modern periodic table::- 18 groups.
(i) metallic character moving from left to right in a period ::-
The metals(such as Na and Mg) are placed on the left of the period and the non metals(such as Cl and S ) are placed on the right of the period and semi metals or metalloids (such as Si and Ge) are in the middle of the period . So , the metallic character goes on decreasing as we move from left to right in a period.
(ii) metallic character moving down in a group.::-
The electropositivity (tendency to lose electrons) increases down the group . So, the metallic character increases down the group.
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