The electron cloud model describes which of the following?

the negative charge of the electron

the trails left by an electron as it moves around the nucleus

the group of protons that are in the nucleus

the neutron orbital

2nd question:

if an oxygen atom has 8 protons and 10 neutrons in its nucleus, what is its atomic number?

18

10

8

not enough information to calculate

3rd question:
if an atom loses a neutron, what happens?

its mass stays the same, and it becomes a different element.

its mass stays the same, and it is still the same element.

its mass is lowered, and it becomes a different element.

its mass is lowered, but it is still the same element.