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.

depends on what you mean by "group." for order, it would be coleoptera (beetles). for class, it would be insecta (insects). for phylum, it would be the arthropoda (animals with jointed exoskeletons).

explanation:

their crystal patterns have been disrupted by stress