Questions and Answers
What comprises more than 99.9% of the mass of an atom?
Nucleus
What is the basic building block of all matter?
Atom
Where is the electron located within an atom?
Surrounding the nucleus
What contains 70% of the mass of an atom?
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What is the smallest unit into which a chemical element can be broken down without losing its chemical identity?
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An atom consists of an extremely small, positively charged nucleus surrounded by a cloud of negatively charged protons.
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The nucleus contains more than 99.9% of the mass of the atom.
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An atom is the smallest unit into which a chemical element can be broken down without losing its chemical identity.
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Radioactivity can be thought of as changes which occur within the nuclei of atoms.
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The nucleus contains 70% of the mass of the atom. T or F
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Study Notes
Atomic Structure
- More than 99.9% of an atom's mass is comprised of the nucleus.
- The nucleus contains 70% of the atom's mass.
Atomic Composition
- An atom consists of a small, positively charged nucleus surrounded by a cloud of negatively charged electrons.
Atomic Identity
- An atom is the smallest unit into which a chemical element can be broken down without losing its chemical identity.
Radioactivity
- Radioactivity can be thought of as changes which occur within the nuclei of atoms.
Electron Location
- Electrons are located outside the nucleus of an atom.
Nuclear Mass
- The nucleus contains the majority of the atom's mass.
