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science flashcards 2

nucleus in physical science, an atoms central region, which is made up of protons and neutrons
electron cloud The region of negative charge surrounding an atomic nucleus that is associated with an atomic orbital.
proton a subatomic particle that has a positive charge and that is located in the nucleus of the atom;the number of protons in the nucleus is the atomic number, which determines the identity of an element
neutron a subatomic particle that has no charge and that is located in the nucleus of the atom
electron a subatomic particle that has a negative charge
atomic number tells you how many protons are in an atom of the element
average atomic mass The average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally-occurring element. It is the weighted average of the masses of naturally-occurring isotopes
mass number the sum of the numbers of protons and neutrons in the nucleus of an atom
molar mass The mass of one mole of a substance
molecular mass A number equal to the sum of the atomic masses of the atoms in a molecule. The molecular mass gives the mass of a molecule relative to that of the 12C atom, which is taken to have a mass of 12.
isotope an atom that has the same number of protons (or the same atomic number) as other atomsof the same element do but that has a different number of neutrons (and thus a different atomic mass)
ion an atom, radical, or molecule that has gained or lost one or more electrons and has a negative or posotive charge
cation A cation is an ionic species with a positive charge.
anion An ionic species having a negative charge.
mole the SI base unitused to measure the amount of a subatance whose number of particles is the same a the number of atoms of carbon in exactly 12g of carbon-12
avagadro's number Avogadro's number is the number of particles found in one mole of a substance. It is the number of atoms in exactly 12 grams of carbon-12. This experimentally determined value is approximately 6.022 x 1023 particles per mole.
Created by: dfrance33



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