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CP 3 Vocab

chapter 3 vocab

atom small dense postive core (nucleus) surrounded by a large space of electrons
plum pudding model a model where an atom is composed of electrons surrounded by a soup of positive charge to balance out the negative
gold foil experiment experiment investigated the structure of an atom
orbitals mathematical function that describes the wave-like behavior of either one electron or a pair of electrons in an atom
nucleus contains protons and nuetrons
Protons 1/1H or 1/1P, mass= 1amu, positive charge, in nucleus
electron 0/-1e, negative charge, outside nucleus
neutron 1/0n, mass= 1amu, no charge, in nucleus
mass number sum of protons and neutrons
atomic number number of protons in an atom
ion non neutral, have gained or lost electrons
isotope different types of atoms of the same element
atomic mass The mass of an atom, listed in periodic table
valence electrons The electrons in the outermost shell
octet A set of eight valence electrons in an atom or ion, forming a stable configuration.
excited state A stationary state of higher energy than the lowest stationary state
ionization energy The energy needed to remove one or more electrons from a neutral atom to form a positively charged ion
electron affinity positive when the resulting ion has a lower energy
electronegativity a chemical property that describes the ability of an atom to attract electrons
alchemy a medieval endeavor concerned with turning other metals to gold
cathode ray tube a device that emits a beam of electrons
nucleon any subatomic particle found in the atomic nucleus
Law of conservation of mass states that there is no dectable change in the amount of mass present before and after a chemical reaction
Law of Definte proportions states that the elements combine in specific mass ratos to form compounds
Created by: carmen9295



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