Lilly places a rock on the platform of a triple beam balance. She slides the first weight out to the 100g mark, the second weight
out to the 70g mark, and the third weight out to the 8.2g mark.
What is the mass of the rock?

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

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the atomic number of carbon is six, which means that a carbon atom has six protons. carbon has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14. which of these statements are true about carbon and its isotopes? select all that appl