What is the unique number for each element that equals the number of protons in an atom of that element?
Periodic Table

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Science
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6th - 8th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
Back
Atomic number
2.
FLASHCARD QUESTION
Front
What is the basic structural unit of matter?
Back
Atom
3.
FLASHCARD QUESTION
Front
What is the mass of an atom, calculated by adding the number of protons and neutrons in the nucleus of the atom?
Back
Atomic mass
4.
FLASHCARD QUESTION
Front
What is a collection of atoms of one type that cannot be broken down into simpler substances by ordinary chemical or physical means?
Back
Element
5.
FLASHCARD QUESTION
Front
What is a grouping of elements based on similar properties, arranged by columns in the periodic table?
Back
Family
6.
FLASHCARD QUESTION
Front
What is the smallest particle of an element that retains the properties of that element?
Back
Atom
7.
FLASHCARD QUESTION
Front
What is the term for the horizontal rows in the periodic table?
Back
Period
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