Question

question 5 of 10
what period is zn (zinc) in?
a. 2a
b. 30
c. 4
d. 12

Explanation:

In the periodic table, periods are the horizontal rows. Zinc (Zn) has an atomic number of 30. By looking at the periodic table layout, elements in period 4 include those with atomic numbers from 19 (potassium) to 36 (krypton). Zinc is within this range. Option A (2A) refers to a group (vertical column), not a period. Option B (30) is the atomic number, not the period number. Option D (12) is the group number in the older group - naming system for zinc.

Answer:

C. 4