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Periodic Table and Periodicity
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Modern periodic table and classification of elements
JEE Main level
Single correct option
Difficulty 2 of 3
pt011
Across period 5 the subshells are filled in the order
A
5s, 4d, 5p
B
5s, 5p, 4d
C
4d, 5s, 5p
D
5s, 4f, 5p
Answer: A
Period 5 begins with 5s, then the 4d subshell is filled, and the period ends with 5p. Total elements
=
2
+
10
+
6
=
18
.
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