What is the atomic number?
Chemistry - atoms, periodic table

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•
Science
•
8th Grade
•
Hard
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15 questions
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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
Which group of metals is the most reactive?
Back
The most reactive metals are the alkali metals, found in Group 1 of the periodic table.
3.
FLASHCARD QUESTION
Front
What are valence electrons?
Back
Valence electrons are the electrons located in the outermost energy level of an atom, which are involved in chemical bonding.
4.
FLASHCARD QUESTION
Front
What is an atom?
Back
An atom is the basic building block of all matter, consisting of protons, neutrons, and electrons.
5.
FLASHCARD QUESTION
Front
What are groups in the periodic table?
Back
Groups are vertical columns in the periodic table where elements have similar chemical properties.
6.
FLASHCARD QUESTION
Front
What is a period in the periodic table?
Back
A period is a horizontal row in the periodic table, indicating the number of electron shells in the elements.
7.
FLASHCARD QUESTION
Front
What is the mass number?
Back
The mass number is the total number of protons and neutrons in an atom's nucleus.
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