11) Murilo pretende localizar na reta numérica o número 220. +
50
100
150
300
Ele pensou e chegou à conclusão correta de que esse número está entre:
A) 50 e 100
B) 150 e 200
C) 200 e 250
D) 250 e 300

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