For Argon-39, what is its: a number of protons:
b. number of electrons:
c. atomic number:
d. number of neutrons:
e. mass number:
f. complete symbol:

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Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions