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The atomic number of the elements K,L,M and N are 7,10,12 and 17
respectively then
a)Write the electronic configuration
b) Find out the group and period of the elements
c) Arrange them by increasing order of the size
d) Which among them is noble gas?
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Explanation:
a) K - 7
elec.confg = 2,5
group = 15 or 5A
period = 2
L - 10
elec. confg = 2,8
group = 18 or zero
period = 2
M- 12
elec.confg = 2,8,2
group - 2 or 2A
period - 3
N- 17
elec.confg = 2,8,7
group = 17 or 7A
period = 3
b) done already
c) L<K<M<N
d) element L is a noble gas
Go through the chapter, Periodic Table. These are some very basic questions which you'll understand by paying little attention.
Hope it helps :)
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