Q. The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 2nd group and the 4th period?
A) 22
B) 20
C) 10
D) 18
✔ Correct Answer: 20
Exam Insight
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A) 22
B) 20
C) 10
D) 18
✔ Correct Answer: 20
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