Matter is a slightly archaic word for something with mass, as in the conservation of matter (which must be paired with the conservation of energy to still hold true. Mass can be converted back and forth between energy, so therefore so can matter. Of course relativistic mass is conserved as it's a function of the energy of an object in that reference frame.
One lead atom, two nitrogen atoms, four oxygen atoms.
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vertical columns and horizontal rows, hope it helps
Answer:
i think its d im not sure
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