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Which gas makes up the majority of Earth's atmosphere?
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2. Atoms & Elements
The Atom
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Which statement best explains how the mass of an atom is organized?
A
The mass of an atom is primarily due to the empty space between particles.
B
The mass of an atom is evenly distributed between the nucleus and the electron cloud.
C
Electrons contribute the majority of an atom's mass.
D
Most of the mass of an atom is concentrated in its nucleus, which contains protons and neutrons.
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Understand that an atom consists of a nucleus and an electron cloud surrounding it.
Recall that the nucleus contains protons and neutrons, while electrons orbit around the nucleus.
Recognize that protons and neutrons have significantly more mass compared to electrons.
Know that the majority of the atom's mass comes from the protons and neutrons in the nucleus, not from the electrons or the empty space.
Conclude that the mass of an atom is concentrated in its nucleus, which contains nearly all the mass due to protons and neutrons.
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