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Directions: Given an electron configuration of an unknown atom, put a X on on th blank before each number if the configuration is incorrect, and write the symbol an atomic number of the atom that denotes correct electron configuration.
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Explanation:
(i) (a) The electronic configuration of H
−
is 1s
2
(b)The electronic configuration of Na
+
is 1s
2
2s
2
2p
6
(c)The electronic configuration of O
2−
is 1s
2
2s
2
2p
6
(d) The electronic configurations of F
−
is 1s
2
2s
2
2p
6
(ii) The atomic numbers of elements whose outermost electrons are represented by (a)3s
1
(b)2p
3
and(c)3d
1
are 11 (Na), 7 (N) and 21 (Sc) respectively.
(iii) The following configurations indicates
(a) [He]2s
1
(b) [Ne]3s
2
3p
3
(c) [Ar]4s
2
3d
1
(a) Li (Z=3), (b) P(Z=15) and (c) Sc Z=21) respectively.
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