How many electrons are removed from 1.20 × 10-2 g of He(g)\text{He(g)}He(g) atoms to form He+(g)\text{He}^+\text{(g)}He+(g) ions?
4.98×10−274.98 \times 10^{-27}4.98×10−27
3.00×10−33.00 \times 10^{-3}3.00×10−3
1.81×10211.81 \times 10^{21}1.81×1021
7.22×10217.22 \times 10^{21}7.22×1021
