Which pair of elements is in the same period?
Li and Na
Ti and Nb
RB and Zr...
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How did planetesmals form planets? a. they broke apart into smaller chunks.b. they collided and stuck together.c. they cooled and pulled ice together.d. they began to rotate.
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Which factor is likely to impact the possible number of compounds ?
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What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?
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