Question

Atom X contains nine protons and seven neutrons. Atom Z contains nine protons and eight neutrons. Which of the following statements correctly describes the two atoms? (AKS 1a/DOK 1)
A.
They have the same mass number

B.
They are radioactive

C.
They are isotopes

D.
They are atoms of different elements

Answer 1

I thinks the it is question A.