Which of the following statements are true? Select all that apply. All of an atom's electrons are located inside its nucleus.
A proton is much bigger and heavier than an electron.
An electron has a negative electrical charge.

(this answer is correct) An electron has a negative electrical charge.

Explanation:

all electrons have negative charges

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.