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Which one of the following is the smallest unit of matter that has all the properties of an element?
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2. Atoms & Elements
The Atom
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What is the basic unit of all matter?
A
Molecule
B
Atom
C
Electron
D
Proton
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Understand that matter is anything that has mass and takes up space. It is composed of atoms, which are the smallest units that retain the properties of an element.
Recognize that atoms are the basic building blocks of matter. They consist of a nucleus made of protons and neutrons, surrounded by electrons.
Differentiate between atoms and molecules: while atoms are single units, molecules are composed of two or more atoms bonded together.
Identify that protons, neutrons, and electrons are subatomic particles that make up an atom. Protons and neutrons are found in the nucleus, while electrons orbit the nucleus.
Conclude that the basic unit of all matter is the atom, as it is the smallest unit that defines the chemical elements and their isotopes.
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