* GIVING BRAINLIEST* 3Ca+2 FeCl3 -> 3CaCl2 + 2Fe

Calcium metal + Iron Chloride -> Calcium Chloride + Iron metal

Identify the reason that atoms react with each other.

i think its double replacement if i'm not mistaken  

ugh fiel iente of insistí is did kiwis jaj

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72