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Atomic Theory

7th Grade Vocab

Atoms The make up of matter; in solid, liquid, or gas form
Element When something is made up of only one kind of atom
Proton Found inside the nucleus , it has a positive charge
Electron Found on the outside of the nucleus, it has a negative charge
Neutron Has equal mass to a proton but instead has no charge; also found in the nucleus
Nobel Gases Found in Group 18, these are the inert elements, so they are very unreactive
Halogens These elements are very reactive because of their 7 valence electrons, They are found in group 17 & most commonly form bonds with the alkali metals
Transitional Metals These elements are found in groups 3-12 and are reactive while other may not be. it all depends on the element
Alkali Metals These metals are very reactive because of their one valence electrons
Alkali Earth Metals Found in the second column, these metals are slightly less reactivate, unlike the alkali metals
Alloy A metal made by combining two or more metallic elements
Luster Shiny
Ductile Can be drawn into a thin wire
Malleable Can be smashed without crumbling
Density The degree of compactness of a substance; solidity, mass, thickness
Corrosive Rusts
Created by: Karina_Vallejoo