The modern periodic table is organized by?

a. atomic number

b. number of protons in each element

c. atomic weight

d. chemical properties

The actual answer is A. Atomic number, it originally was organized by atomic weight until proton was discovered.

answer: lol

explanation:

lol

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.