Which are true about an ion? Check all that are true.

It will always have more neutrons than protons.

It can have a negative charge.

It will always have fewer neutrons than protons.

It can have a positive charge.

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Correct  

1) It can have a negative charge.

2) It can have a positive charge.

Explanation:

1) If the atom has more electrons than protons, it is a negative ion

2) If it has more protons than electrons, it is a positive ion.

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a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.