Question

What characteristics do atoms of argon-40,
potassium-40, and calcium-40 have in common?

1. same number of neutrons and same number
of protons
2. same number of electrons
3. same number of neutrons
4. same number of protons
5. same number of protons and same number
of electrons
6. same number of neutrons and same number
of electrons
7. same mass

Answer 1

Same mass is the best answer

Answer 2

Okay, thank you!!!

Answer 3

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