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Chemistry

Chemistry Vocab Words

TermDefinition
Element -made of one kind of atom. It can't be broken down during a chemical reaction. It combines with other elements to form compounds.
Symbol -the abbreviation for the element. Always a capital letter, or a capital and a lower case.
Atomic mass -decimal number below the symbol. It is the mass of the protons and neutrons in an element.
Atomic number -located above the symbol. Tells the number of protons in the nucleus of an atom.
Group -vertical column of elements on the periodic tables. These element have similar properties.
Period -elements in a horizontal line on the periodic table. These elements all have the same number of electron levels (valence).
Mass number -number of protons and neutrons in the nucleus of an atom. It is the atomic mass rounded to the nearest whole number.
Protons -positively charged particles located in the atom.
Electrons -negatively charged particles located in the atom.
Neutrons -neutral charged particles located in the atom.
Atomos -Greek word meaning "being able to divide.
Metals -usually shiny and can be formed into shapes (malleable). They are good conductors of electricity.
Nonmetals -most have the properties opposite of metals. Nonmetals are dull and cannot be .
Semimetals -have some properties of both metals and nonmetals.Some semimetals are shiny but cannot be shaped.
Noble Gases -elements that do not combine easily with other elements.
Created by: mckees.20