An electron: (select all that apply.)
has a negative charge
is found in the nucleus
emits energy when it moves to a lower energy orbit from an excited state
has the same mass as a proton

Answer : The correct options are,

An electron has a negative charge.

An electron emits energy when it moves to a lower energy orbit from an excited state.

Explanation :

As we know that there are three subatomic particles which are proton, neutrons and electrons. The proton which are positively charged and the neutron that is neutral (no charge) both are present inside the nucleus and the electron which are negatively charged and it is present outside or around the nucleus.

As per given in the question,

An electron is a subatomic particle that has a negative charge and it emits energy when it moves to a lower energy state from an excited state.

Where as proton and electrons have different masses but same magnitude of charge with opposite charges.

The mass of proton  =

The mass of electron =