If an atom is supplied with excess energy: an electron may change to an excited state
a proton will leave the nucleus
an electron may move to a higher energy level
an electron may move to a lower energy level
an electron may fly off (exit) the energy level

(MULTIPLE CHOICES)

the correct option is option d

it is called the mitotic spindle

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.