explain why atoms contain equal numbers of protons and electrons - atoms are uncharged their for need equal number of posotives and negatives in an atom, recall that most of the mass of n atom is concentrated in the nucleus - mas of a proton=1 mass of nuetron=1mass of electron =v.small, describe atoms of a given element as having the same number of protons in the nucleus and that this number is unique to that element - number of protons doesn't change number of atomic protons number, explain how the existence of isotopes results in relative atomic masses of some elements not being whole numbers - mass number for an atom in periodic table in average of the masses of all isotopes of atoms that make up that element, describe how Mendeleev arranged the elements known at the time in a periodic table by using properties of these elements and their compounds - Mendeleev arranged by mass number.he left gaps as he predicted properties of elements that did not yet exist,

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