What is the atomic number of an element?
Chemistry AP Final Exam

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Chemistry
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9th Grade
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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 are isotopes?
Back
Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.
3.
FLASHCARD QUESTION
Front
What is an alkali metal?
Back
Alkali metals are the elements found in Group 1 of the periodic table, characterized by having one electron in their outermost shell.
4.
FLASHCARD QUESTION
Front
How do you calculate the number of neutrons in an atom?
Back
To find 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 significance of the atomic mass?
Back
The atomic mass is the weighted average mass of an element's isotopes, reflecting both the mass and the relative abundance of each isotope.
6.
FLASHCARD QUESTION
Front
What is the difference between an ion and an isotope?
Back
An ion is an atom that has gained or lost electrons, resulting in a charge, while an isotope is an atom with a different number of neutrons.
7.
FLASHCARD QUESTION
Front
What is the electron configuration of sodium (Na)?
Back
The electron configuration of sodium is 1s² 2s² 2p⁶ 3s¹.
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