1. Which of the following facts did Dalton realize? a. Two different elements can only form one type of compound.
b. Each compound contains a fixed ratio of atoms.
c. Atoms of the same element can have different masses.

After answering please explain why and/or how.

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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