Question

Atoms of two different elements must have different

A. Electrical charges
B. Number of neutrons
C. Atomic numbers
D. Energy levels

Answer 1

atomic numbers

Step-by-step explanation:

In order for two atoms to be different, they have to have a different number of protons. Protons are represented by the atomic number. Thus, atoms of two DIFFERENT elements must have different atomic numbers.

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Answer 2

Step-by-step explanation:

C. Atomic numbers....