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Unit 3 Vocabulary

Across
Name for the vertical columns on the periodic table
Category of elements found on the left side of the periodic table. These are malleable and good conductors
Subatomic particle that has no charge
Category of elements found on the right side of the periodic table. These can be brittle and poor conductors
Number on the periodic table that is equal to the protons plus the neutrons in an element
Atoms of the same element that have a different number of electrons (these have a charge)
Family of metals in Group 2. Not as reactive as Group 1.
Number on the periodic table that is equal to the number of protons in an element
Family of elements found in Group 18. These elements are very unreactive.
Subatomic particle that has a positive charge
Atoms of the same element that have a different number of neutrons
Down
The total number of electrons found in the outermost energy level of the Bohr model
Name for the horizontal rows on the periodic table
Subatomic particle that has a negative charge
Family of metals found in the center section of the periodic table.
Family of elements in Group 1. Most reactive metals.
Scientist who fixed the original periodic table. He arranged elements by atomic number.
Scientist who first created a periodic table. He arranged elements by atomic mass.
Center of the atom that contains the protons and neutrons
Family of elements found in Group 17. Most reactive nonmetals.
Category of elements touching the zigzag line on the periodic table. Also called semiconductors.
Name for atoms that have gained electrons and become negatively charged.
Name for atoms that have lost electrons and become positively charged.