The mass number of an atom is basically the total number of protons and neutrons.
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An object with a high mass close to the Earth could be sent out into a collision course with the asteroid, knocking it off course. When the asteroid is still far from the Earth, a means of deflecting the asteroid is to directly alter its momentum by colliding a spacecraft with the asteroid.
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Au is the symbol for gold. It comes from Latin word for gold, which is Aurunum. Its atomic number is 79.
the primary consumer in those photos would be C