8moles of Na2Cr2O2 is how much mass​

= 2 × 23 + 2 × 52 + 2 × 16

= 182 grams

1 mole of weighs = 182 g

8 moles weigh = 8× 182

=

or

increased stability in the completion of fluorine's outer shell.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer