Set: Chapter 3 Elements and the periodic table

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All 34 Terms

Term Definition
Atomic mass The average mass of one atom of an element.
Periodic table A chart of the elements showing the repeating pattern of their properties.
Nucleus The central core of an atom containing protons and usually neutrons.
Proton A small, positively- changed particle in the nucleus of the atom.
Neutron A small particle in the nucleus of the atom, with no electrical charge.
Electron A tiny, negatively-charged particle that moves around the nucleus of an atom.
Atomic mass unit (amu) A unit used to measure the mass of particles in atoms; a proton or neutron has a mass of 1amu.
Atomic number The number of protons in the nucleus of an atom.
Chemical symbol A one- or two- letter representation with different properties.
Group Elements in the same vertical column of the periodic table; also called family.
Family Elements in the same vertical column of periodic table; also called group.
Period A horizontal row of elements in the periodic table.
Valence electron One of the electrons farthest away from the nucleus of the atom; these electrons are involved in a chemical reaction.
Malleable A term used to describe material that can be hammered or rolled into shape.
Alloy A mixture of two or more metals.
Ductile A term used to describe a material that can be pulled out into a long wire.
Alkali metal An element in Group 1 of the periodic table., Most reactive group of metals
Conductor A substance that transmits heat or electricity easily.
Alkaline earth metal An element in Group 2 of the periodic table., Second most reactive group of metals
Magnetic A characteristic of those metals that are attracted to magnets and can be made into magnets.
Transition metal An element in Groups 3 through 12 of the periodic table.
Reactivity The ease and speed with which an element or compound combines with other elements and compounds.
Lanthanide An element in the first row of the rare earth elements in the periodic table., they are pulled to the bottom
Corrosion The gradual wearing away of a metal element due to a chemical reaction.
Actinide An element in the second row of the rare earth elements in the periodic table., pulled to the bottom of the table
Nonmetal An element that lacks most of the properties of metals.
Diatomic molecule A molecule composed of two atoms of the same element., like O2
Halogen family The elements in Group 17 of the periodic table., most reactive nonmetals
Noble gas An element in group 18 of the periodic table., they don't react
Metalloid An element that has some of the characteristics of metals and some of the characteristics of nonmetals.
Semiconductor An element that can conduct electricity under some conditions.
Plasma A state of matter in which atoms are stripped of their electrons and the nuclei packed closely together.
Nuclear fusion The process in which smaller nuclei combine into larger nuclei, forming heavier elements.
Supernova An explosion of a massive star.

Set Information

Terms 34
Creator Brooksj1263
Created December 20, 2007
Groups None
Tags seventh, jhs, grade, brooks
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Description

Vocab review for 7th grade - chapter 3 Elements and the periodic table

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Most Missed Words

  1. Actinide → An element in the second row of the rare earth elements in the periodic table., pulled to the bottom of the table - 29 misses
  2. Alkaline earth metal → An element in Group 2 of the periodic table., Second most reactive group of metals - 28 misses
  3. Lanthanide → An element in the first row of the rare earth elements in the periodic table., they are pulled to the bottom - 28 misses
  4. Alkali metal → An element in Group 1 of the periodic table., Most reactive group of metals - 22 misses
  5. Halogen family → The elements in Group 17 of the periodic table., most reactive nonmetals - 21 misses
  6. Valence electron → One of the electrons farthest away from the nucleus of the atom; these electrons are involved in a chemical reaction. - 19 misses
  7. Reactivity → The ease and speed with which an element or compound combines with other elements and compounds. - 18 misses