Answer:
He, 2, 2, 2, 4, 4-2=2, 1, 8
I, 53, 53, 53, 127, 127-53= 74, 5, 7
Explanation:
um check the periodic table for the rest?
Answer:first D. 88L
Second A 2*10^24
At stp 1 mole = 22.4L
mw Cl2= 70.9
280 g =280/70.9 moles, about 4
4*22.4 = about 88
aw Sr 87.6 —> 6.02214076*10^23 atoms = 1 mole
