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Fantom [35]
3 years ago
14

Please help!!! Will mark brainliest!!!

Biology
1 answer:
Sauron [17]3 years ago
3 0

third fourth first fifth second

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The atomic number is by definition the number of protons, positively charged particles, contained within the atomic nucleus. So if there are 7 protons, there MUST be 7 electrons, 7 negatively charged particles. Why? Because matter is electrically neutral, and positive and negative particles must be equal.

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