Which of the following would be expected to dissolve very readily in water? cbr4 h2 ch4 naoh

I believe your answer would be NaOH.

Hope this helps.

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