group/family - A vertical column in the periodic table of elements; elements in same group have similar reactivity, period - A horizontal row. All elements in a row have the same number of electron shells., atom - the smallest particle into which an element can be divided without losing its chemical identity, element - a pure substance made up of only one type of atom, chemical bond - the force that holds atoms together in a chemical compound, chemical reactivity - the ability of a substance to undergo a chemical change or reaction when interacting with other substances, photon - quanta of light; the smallest possible packets of electromagnetic energy, energy level - fixed distances from the nucleus of an atom where electrons may be found; electron shells, emission spectra - pattern of lines that are seen when light given off from glowing hot gas is put through a prism; to identify the elements present in a sample, wave-particle duality - theory states that waves can exhibit particle-like properties while particles can exhibit wave-like properties, ionic bond - the complete transfer of valence electron(s) between atoms; generates two oppositely charged ions, covalent bond - occurs when pairs of electrons are shared by atoms, nucleus - small, dense region consisting of protons and neutrons at the center of an atom, electron - a negatively charged particle that moves around the nucleus of the atom, proton - a positively charged particle that is found in the nucleus of an atom; the number of protons identifies the atom, neutron - a particle with no charge that is the the same size as a proton and also found in the nucleus of an atom, valence electron - electrons found in the outermost energy level; determines an atoms chemical behavior, electron cloud - the region around a nucleus where an electron may be found, anion - a negatively charged ion; has more electrons than protons, cation - a positively charged ion; has less electrons than protons,

IPC Periodic Table

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