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Questions and Answers
Atoms are visible to the naked eye.
Atoms are visible to the naked eye.
False (B)
The nucleus of an atom has a negative charge.
The nucleus of an atom has a negative charge.
False (B)
Electrons have a similar mass to protons and neutrons.
Electrons have a similar mass to protons and neutrons.
False (B)
The majority of an atom's mass is concentrated in its electron shells.
The majority of an atom's mass is concentrated in its electron shells.
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The radius of an atom is typically 10^-10 meters.
The radius of an atom is typically 10^-10 meters.
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If an atom were the size of a sports arena, its nucleus would be roughly the size of a basketball.
If an atom were the size of a sports arena, its nucleus would be roughly the size of a basketball.
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Electrons closer to the nucleus have higher energy levels.
Electrons closer to the nucleus have higher energy levels.
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The periodic table arranges elements based on their atomic mass only.
The periodic table arranges elements based on their atomic mass only.
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All elements have the same number of electron shells.
All elements have the same number of electron shells.
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The discovery of atoms and their structure can only be learned through reading text books.
The discovery of atoms and their structure can only be learned through reading text books.
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Flashcards
Atom
Atom
Basic unit of matter composed of subatomic particles.
Subatomic Particles
Subatomic Particles
Particles smaller than an atom, including protons, neutrons, and electrons.
Nucleus
Nucleus
Center of an atom containing protons and neutrons.
Protons
Protons
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Neutrons
Neutrons
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Electrons
Electrons
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Electron Shells
Electron Shells
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Atomic Mass
Atomic Mass
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Periodic Table
Periodic Table
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Electrostatic Forces
Electrostatic Forces
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Study Notes
What is an Atom?
- Atoms are minuscule particles, invisible to the naked eye and barely discernible even with the most powerful microscopes.
- Everything in the universe is composed of atoms, including humans, the device you're using, and the air we breathe.
- The human body alone contains approximately 7 × 10^27 atoms.
The Structure of an Atom
- Atoms are made up of even smaller particles known as subatomic particles.
- At the center of an atom lies the nucleus, containing positively charged protons and neutrally charged neutrons.
- The nucleus has a positive charge due to the presence of protons.
- Electrons, negatively charged particles, orbit the nucleus, similar to planets orbiting the sun.
- The attraction between the positive nucleus and negative electrons is due to electrostatic forces.
Mass and Size of Atoms
- Protons and neutrons have roughly the same mass, while electrons are significantly lighter, about 2000 times less massive.
- The majority of an atom's mass is concentrated in its nucleus.
- The radius of an atom, the distance from the nucleus to the outermost electron shell, is typically 10-10 meters.
- Although the nucleus contains most of the atom's mass, it is significantly smaller than the overall atom.
- If an atom were the size of a sports arena, its nucleus would be roughly the size of a pea.
Electron Shells
- Electrons orbit the nucleus in specific paths or shells, each with a distinct energy level.
- Electrons closer to the nucleus have lower energy levels, while those in outer shells possess higher energies.
- The arrangement of electrons in shells is similar to planets orbiting the sun, but electrons can only occupy specific orbits at specific energy levels.
The Periodic Table and Atomic Structure
- Different elements have varying numbers of shells and electrons.
- The periodic table is a representation of the elements arranged based on their atomic structure and properties.
- To learn more about the discovery of atoms and their structure, you can watch related videos.
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Description
This quiz explores the fundamental concepts of atoms, including their structure, mass, and size. Learn about the components of atoms, such as protons, neutrons, and electrons, and understand their roles in the universe. Get ready to test your knowledge on the building blocks of matter!
