Q. The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 1st group and the 4th period?
A) 17
B) 21
C) 9
D) 19
✔ Correct Answer: 19
Exam Insight
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A) 17
B) 21
C) 9
D) 19
✔ Correct Answer: 19
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