xx.arianagrande
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Why is the density of the Group 1 elements low?
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scimus63
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density is simply mass/volume, so not a lot of mass in a given volume. They are largest atoms in their periods in the periodic table, since they have a small nuclear charge pulling in the electrons, the nucleus also has the lowest mass for the period they are in, so they are big and have low masses, so they have low densities.

Remember as you cross a period in the periodic table the elements become smaller, most people assume they get larger but this is not the case, since the increasing nuclear charge pulls the electrons in more tightly.
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xx.arianagrande
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(Original post by scimus63)
density is simply mass/volume, so not a lot of mass in a given volume. They are largest atoms in their periods in the periodic table, since they have a small nuclear charge pulling in the electrons, the nucleus also has the lowest mass for the period they are in, so they are big and have low masses, so they have low densities.

Remember as you cross a period in the periodic table the elements become smaller, most people assume they get larger but this is not the case, since the increasing nuclear charge pulls the electrons in more tightly.
OHHH that makes sense now. Thank you!
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