What is an atom?
Atoms, Ions, and Isotopes Review

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Science
•
9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus containing protons and neutrons, surrounded by electrons in an electron cloud.
2.
FLASHCARD QUESTION
Front
What is an ion?
Back
An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net electrical charge. Cations are positively charged ions, while anions are negatively charged.
3.
FLASHCARD QUESTION
Front
What is an isotope?
Back
Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses.
4.
FLASHCARD QUESTION
Front
How do you calculate the number of neutrons in an atom?
Back
To calculate the number of neutrons, subtract the atomic number (number of protons) from the atomic mass (rounded to the nearest whole number).
5.
FLASHCARD QUESTION
Front
What is the atomic number?
Back
The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity and its position on the periodic table.
6.
FLASHCARD QUESTION
Front
What is the role of electrons in an atom?
Back
Electrons are negatively charged particles that orbit the nucleus of an atom. They are involved in chemical bonding and determine the atom's reactivity.
7.
FLASHCARD QUESTION
Front
What is the nucleus of an atom?
Back
The nucleus is the central part of an atom, containing protons and neutrons. It is positively charged due to the presence of protons.
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