Identify and name the metals out of the following elements whose electronic configurations are given below.
(a) 2, 8, 2
(b) 2, 8, 1
(c) 2, 8, 7
(d) 2, 1
NCERT Class X
Science - Exemplar Problems
Chapter_Periodic Classification of Elements
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a) 1s2 2s2 2p6 3s2 : Z = 12
it is a metal in group 2: period 3.. magnesium,
b) 1s2 2s2 2sp6 3s1 : Z = 11
it is an alkali metal.... it is Sodium in group 1.. in period 3..
c) 2, 8, 7
1s2 2s2 2p6 3s2 3p 5 : Z =17 period 3.. group 17.
it is a halogen.. next to noble gas config... it is chlorine.
d) 1s2 2s1
group 1,,, period 2. alkali metal.. Lithium...
it is a metal in group 2: period 3.. magnesium,
b) 1s2 2s2 2sp6 3s1 : Z = 11
it is an alkali metal.... it is Sodium in group 1.. in period 3..
c) 2, 8, 7
1s2 2s2 2p6 3s2 3p 5 : Z =17 period 3.. group 17.
it is a halogen.. next to noble gas config... it is chlorine.
d) 1s2 2s1
group 1,,, period 2. alkali metal.. Lithium...
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