The atomic number of calcium is 20. how many protons does it have?
A) 10 protons
B) 20 protons
C) 30 protons
D) 40 protons
Correct Answer:
B) 20 protons
Explanation:
The atomic number of an element indicates the number of protons in its nucleus. In the case of calcium (Ca), which has an atomic number of 20, it has 20 protons in its nucleus. Options A, C, and D represent incorrect numbers of protons for calcium.
