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Lesson 1.2
vocabulary
9
Science
8th Grade
09/29/2022

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Term
Atomic mass
Definition
The average mass of all the isotopes of an element.
Term
Periodic table
Definition
An arrangement of the elements showing the repeating pattern of their properties.
Term
Chemical symbol
Definition
A one- or two-letter abbreviation for an element.
Term
Period
Definition
A horizontal row of elements in the periodic table.
Term
Group
Definition
Elements in the same vertical column of the periodic table; also called family.
Term
Representation
Definition
A drawing or image of an actual thing.
Term
Elements
Definition
Any substance that cannot be decomposed into simpler substances by ordinary chemical processes.
Term
Characteristics
Definition
A feature or quality belonging typically to a person, place, or thing and serving to identify it.
Term
Mendeleev
Definition
The Russian chemist, he invented the periodic table.
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