D = m / V
0.736 = 225.0 / V
V = 225.0 / 0.736
V = 305.7 cm³
Even though Hydrogen is originally in group 1, based on this property, we can say it is in group 6.
Because:
Group 6 would mean that it only needs 2 more valence electrons till the octet (8 valence electrons). This would make it reactive, yet, in normal conditions, unlike group 7.
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