First Semester Test Review--Part 2

Flashcard
•
Science
•
6th - 8th Grade
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is an atom?
Back
An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus made of protons and neutrons, surrounded by electrons.
2.
FLASHCARD QUESTION
Front
What are the three main subatomic particles?
Back
The three main subatomic particles are protons (positively charged), neutrons (neutral), and electrons (negatively charged).
3.
FLASHCARD QUESTION
Front
What is the atomic number of an element?
Back
The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.
4.
FLASHCARD QUESTION
Front
What is atomic mass?
Back
Atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu). It is approximately equal to the number of protons plus neutrons.
5.
FLASHCARD QUESTION
Front
Where are electrons located in an atom?
Back
Electrons orbit the nucleus of an atom in energy levels or shells.
6.
FLASHCARD QUESTION
Front
What is a molecule?
Back
A molecule is a group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.
7.
FLASHCARD QUESTION
Front
What is a compound?
Back
A compound is a substance formed when two or more different elements chemically bond together in a fixed ratio.
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