LOOK AT THE SCREENSHOTS

Question 19: 4. -2

Question 20: 1. -1

Explanation:

Protons always have a positive (+) charge.

Neutrons always are a neutral (0) charge, or no charge.

Electrons always have a negative (-) charge.

Question 19:

We have 8 protons, so a +8 charge.

We also have 10 electrons, so a -10 charge.

-10 + 8 = -2, or a -2 charge.

Question 20:

We have 1 proton, so a +1 charge.

We also have 2 electrons, so a -2 charge.

1 - 2 = -1, or a -1 charge.

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