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02-10-2020
Chemistry

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Atoms of two different elements must have different
1. electrical charges.
2. numbers of neutrons.
3. atomic numbers
4. energy levels.

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Horses13 Horses13

05-10-2020

Answer:

C atomic number

Explanation:

As u go from left to right the atomic number changes

So C is the answer,

I took the test on edge and that was the answer

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