Question

3. An element has 12 protons. The group and period to which this element belongs to is
(a) 2nd group, 3rd period
(b) 2nd group, 2nd period
(c) 3rd group, 2nd period
(d) 3rd group, 3rd period
OR
Which of the following is correct order of atomic size?
(a) Li< Na <K<Rb <Cs
(b) Li> Na > K> Rb > Cs
(c) Na <K<Li<Rb <Cs
(d) K<Na <Li<Rb < Cs​

Answer 1

Answer:

3 group 3 period this answer

Answer 2

Answer:

ATOMIC NUMBER =12

ELECTRONIC CONFIGURATION

K=2

L=8

M=2

SO

GROUP NUMBER IS 2

AND

PERIOD NUMBER IS 3

or

$li < na< k< rb< cs$

as atomic size increases with going down to the group

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