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Questions and Answers
Questions and Answers
What comprises more than 99.9% of the mass of an atom?
What comprises more than 99.9% of the mass of an atom?
- Neutrons
- Protons
- Nucleus (correct)
- Electrons
What is the basic building block of all matter?
What is the basic building block of all matter?
- Molecule
- Nucleus
- Atom (correct)
- Electron
Where is the electron located within an atom?
Where is the electron located within an atom?
- In the outermost shell
- Surrounding the nucleus (correct)
- Within the nucleus
- Between protons and neutrons
What contains 70% of the mass of an atom?
What contains 70% of the mass of an atom?
What is the smallest unit into which a chemical element can be broken down without losing its chemical identity?
What is the smallest unit into which a chemical element can be broken down without losing its chemical identity?
An atom consists of an extremely small, positively charged nucleus surrounded by a cloud of negatively charged protons.
An atom consists of an extremely small, positively charged nucleus surrounded by a cloud of negatively charged protons.
The nucleus contains more than 99.9% of the mass of the atom.
The nucleus contains more than 99.9% of the mass of the atom.
An atom is the smallest unit into which a chemical element can be broken down without losing its chemical identity.
An atom is the smallest unit into which a chemical element can be broken down without losing its chemical identity.
Radioactivity can be thought of as changes which occur within the nuclei of atoms.
Radioactivity can be thought of as changes which occur within the nuclei of atoms.
The nucleus contains 70% of the mass of the atom. T or F
The nucleus contains 70% of the mass of the atom. T or F
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Flashcards
Flashcards
Atom building block?
Atom building block?
The smallest unit of a chemical element that retains its properties.
Atom's core?
Atom's core?
The central, positively charged part of an atom.
Electron location
Electron location
Orbiting the nucleus.
Nucleus mass %
Nucleus mass %
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Nucleus mass %
Nucleus mass %
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Atom's key parts
Atom's key parts
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Subatomic particles charge ?
Subatomic particles charge ?
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Atom mass location?
Atom mass location?
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Radioactivity originates where?
Radioactivity originates where?
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Nucleus mass percentage (70%)?
Nucleus mass percentage (70%)?
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Flashcards
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Study Notes
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.
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