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Q3S2 Periodic Table

Grade 8 Q3 Seq 2 - The Periodic Table

TermDefinition
Elements pure substances made of only one kind of atom
Atoms the smallest unit of matter that keeps the properties of an element
Compounds substances made of two or more different elements chemically combined
Periodic table a chart that organizes elements by their properties and atomic number
Groups vertical columns on the periodic table where elements have similar properties
Properties characteristics used to describe matter, like color, density, or reactivity
Subatomic particles the smaller parts of an atom: protons, neutrons, and electrons
Protons positively charged particles found in the nucleus of an atom
Neutrons particles with no charge found in the nucleus of an atom
Electrons negatively charged particles that move around the nucleus of an atom
Nucleus the center of an atom that contains protons and neutrons
Element group a set of elements in the same column of the periodic table with similar chemical behaviors
Element family another name for a group of elements with similar properties on the periodic table
Period a horizontal row on the periodic table showing elements with the same number of electron shells
Valence electron an electron in the outermost shell of an atom that determines how it reacts with other atoms
Alkali metals elements in Group 1 of the periodic table that are very reactive and have one valence electron
Alkaline earth metals elements in Group 2 that are reactive and have two valence electrons
Halogens elements in Group 17 that are very reactive nonmetals with seven valence electrons
Noble gases elements in Group 18 that are stable and unreactive because they have full outer electron shells
Electron shells energy levels around the nucleus where electrons are found
Metals elements that are shiny, good conductors of heat and electricity, and can be shaped easily
Metalloids elements with properties of both metals and nonmetals
Nonmetals elements that are usually dull, poor conductors, and brittle.
Created by: user-1840993
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