What is the atomic number of an element?
Atoms & Chemical Reactions Unit 2 Test (updated 2024)

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Science
•
7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.
2.
FLASHCARD QUESTION
Front
What charge do neutrons have?
Back
Neutrons have no charge (they are neutral).
3.
FLASHCARD QUESTION
Front
What is the difference between ionic and covalent bonds?
Back
Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.
4.
FLASHCARD QUESTION
Front
What happens during a chemical change?
Back
A new substance is formed during a chemical change, while no new substance is formed during a physical change.
5.
FLASHCARD QUESTION
Front
Why do protons and electrons stay near each other?
Back
Protons (positive charge) and electrons (negative charge) attract each other due to their opposite charges.
6.
FLASHCARD QUESTION
Front
What is an atom?
Back
An atom is the smallest unit of matter that retains the properties of an element.
7.
FLASHCARD QUESTION
Front
What are the three main subatomic particles?
Back
The three main subatomic particles are protons (positive charge), neutrons (no charge), and electrons (negative charge).
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