Question

Which of the following pairs of elements are both in the same period?

a. Kr and Na
b. Cr and W
c. Ca and Ge
d. F and Cl

Answer 1

Fluorine (F) and Chlorine (Cl) are both in the same period of the periodic table.

Step-by-step explanation:

In the periodic table, elements in the same period are arranged horizontally. So, we need to identify the pairs of elements that are in the same row.

From the given options, the answer is (d) F and Cl. Fluorine (F) and Chlorine (Cl) are both in the same period, which is the second period.

Therefore, the correct pair is F and Cl.