The effect of a catalyst is described by arrow a in the following diagram:

the answer is FALSE

the green line is the reaction with the catalyst.

and the red line is without the catalyst.

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

level 4 to level 2 : ))