Question

please answer.... This is my first Question​

Answer 1

Answer:

a)D; b)G; c)E- one more shell; d) inert gases; e)8- valency is electrons in outermost shell

Explanation:

a) group no. gives valency

b) non - metals start from 13th group and 13 indicates its valency is 3

c) greater the group no. more will be shell no.

d) 18th group elements are unreactive due to filled outermost shell

e) configuration- 1s2 2s2 2p6

Answer 2

$\Large{\underline{\underline{\red{\tt{\purple{\leadsto } SolutioN:-}}}}}$

$\tt Given\:table\:to\:us\:is:-$

$\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|} \cline{1-10}&1&2& 3-12 &13&14&15&16&17&18 \\ \cline{1-10} 2&A&&&G&&B&H&&C \\ \cline{1-10} 3&&D&&&E&&&&F \\ \cline{1-10} \end{tabular}$

$\underline{\green{\tt{\mapsto a) Which\: element\:is\:metal\:with\:valency\:2? }}}$

• Here D is a metal with valency 2 , since in its outermost orbit it has two electrons.

$\underline{\green{\tt{\mapsto b) Which\: element\:is\:a\:non-metal\:with\:valency\:3?}}}$

• B is a non metal with valency 3 .

$\underline{\green{\tt{\mapsto c) Out\:of\:B\:and\:E\:which\:has\:larger\: atomic\: radius\:and\:why?}}}$

• E has bigger atomic radius than B. . In a period table the atomic radius increases down the group.

$\underline{\green{\tt{\mapsto d) Write\:a\: common\:name\:for\:family\:of\:C\:\&\:F.}}}$

• C and F both belong to noble gases. They have 8 electrons in their valence shell , except for Helium which has 2 electrons , and thus completing their octet and duplet.

$\underline{\green{\tt{\mapsto e) Write\:the\:valency\:of\:C\:\&\:give\: reasons.}}}$

• The valency of C is 0 , means it does not react with any other element. Since it has already completed its octet . In group 18 all elements are noble gases.