An electron enters when it has absorbed energy and moved to a higher energy level.
a. an orbit
b. an excited state
c. a ground state
d. a quantum level

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

the correct answer would be d. hope this !

i think its 5049.

i hope this !

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8