B.
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Five valence electrons for one nitrogen and 10 valence electrons for two nitrogens
The answer is 15 bc you multiply the coefficient but the subscript
Oxygen is something that activated Cellar Reapiration that convets nutrients into energy (ATP).
Formation of mountains by one continental plate moving into another (Indian plate pushing north, forming the Himalayas)
Vocanoes from an oceanic plate being submerged beneath another plate and melting, causing liquid hot magma to rise to the surface
