Physics for IGCSE & O level - Atoms And Radioactivity (Section 8 - No. 27)
What is the atomic number of an element?
The number of neutrons in its nucleus.
The number of protons in its nucleus.
The total number of protons and neutrons in its nucleus.
The number of electrons in its outermost shell.
Explanation
The atomic number is the number of protons.
Comments (0)
