Solve the problem. express your answer to the correct number of significant figures. 6.221 × 7.11 − 13.7 =

6.221 × 7.11 − 13.7

first we determine the product of 6.221 and 7.11 and round the value to minimum number of significant figures which is "3"   since  7.11 has "3" significant figures and 6.221 has "4" significant figures

so Product = 6.221 × 7.11 = 44.2

now we do the subtraction , and round the answer to minimum decimal number

44.2 - 13.7

30.5  

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

im pretty sure its b