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Chapter 4 terms,HS

Chapter 4 chemistry terms

Nucleus an atom's central region, which is made up of protons and neutrons.
Electron Cloud the area in which the electrons are located.
Proton a subatomic particle that has a positive charge; located inside the nucleus.
Neutron a subatomic particle that has no charge; located inside the nucleus.
Electron A subatomic particle that has a negative charge.
Atomic Number The number of protons in the nucleus of an atom.
Average Atomic Mass is equal to the mass in grams of 1 mole in the element.
Mass Number The sum of the numbers if protons and neutrons in the nucleus of an atom.
Molar Mass the mass in grams of 1 mole of a substance.
Molecular Mass A number equal to the sum of the atomic masses of the atoms in a molecule
Isotope an atom of the same number of prtons as other atoms of the same element do but has a different number of neutrons.
ion an atom or molecule which has gained or lost one or more of its valence electrons, giving it a net positive or negative electrical charge.
Cation an ionic species with a positive charge
Anion An ionic species having a negative charge
Mole the SI base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms of carbon in exactly 12g of carbon-12.
Avagadro's Number 6.022x10^23
Orbital a region in an atom where there is a high probability of finding electrons.
Valence Electron an electron that is found in the outermost shell of an atom and that determines the atom's chemical properties.
Photon a unit or quantum of light.
Energy Level One of a set of states of a physical system associated with a range of energies. Electrons in an atom, for example, can shift between the different energy levels corresponding to orbitals in different shells
Unified Atomic Mass Unit a unit of mass that describes the mass of an atom or molecule; it is exactly 1/12 the mass of a carbon atom with the mass number 12.
Created by: mmalone15