*Connexus* Which result occurs during an endothermic reaction? *

-Heat is absorbed from the environment into the chemical(s).

-Heat absorbed from the environment equals heat released into the environment.

-Heat is released from the chemical(s) into the environment.

increased stability in the completion of fluorine's outer shell.

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

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