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Chem Test 1: Ch 3

Vocabulary Ch 3: Chemistry an Introduction Timberlake

Alkali Metal Group 1 A, soft shiny with one valance electron (exclude Hydrogen)
Alkaline Earth Metals Group 2A, 2 valence electrons
Atom Smallest particle of element that retains its characteristics
Atomic Mass weighted average mass of all isotopes
Amu Atomic mass unit, used to measure atoms and subatomic particles
Atomic Number Number of protons in an atom
Compound Pure substance containing 2 or more elements, can be broken down by chemical process
Electron Negatively charged particle, basically no mass, e-
Element Pure substance that cannot be broken down by a chemical process
Energy Level Group of electrons with similar energies
Group Vertical Column, contains elements with similar physical and chemical properties
Group Number Top of each group, indicates number of valence electrons
Halogens Group 7A
Heterogeneous Mixture Mixture that is not uniform
Homogeneous Mixture Mixture that is uniform
Ionization Energy Energy needed to remove least tightly bonded valence electron
Isotope Atom with different mass number, same atomic number, but different physical properties
Mass Number Total number of neutrons and protons in atom
Metal Left side of periodic table, shiny, malleable, ductile, good conductor of heat and electricity
Metalloid on zigzag line, properties of metals and non metals
Mixture physical combination of 2 or more substances that don’t change their identities
Neutron Mass: 1 amu, in nucleus, symbol: n
Noble Gas Group 8A, generally un reactive and seldom combined with others
Nonmetal Right side of periodic table, little or no luster, poor conductor
Nucleus center of atom contains proton and neutron
Orbital region around nucleus where electrons are found
Period horizontal row of elements
Physical Properties characteristics that can be observed or measured
Proton mass: 1 amu, in nucleus, symbol: p or p+
Pure substance matter with fixed composition: elements and compounds
Valence Electrons Electrons in outermost energy level of atom
Created by: kallenpoole