Multiple Choice
Which element has 25 protons in its nucleus?
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4. Atoms and Elements
The Atom (Simplified)
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In the simplified model of the atom, what makes up most of the volume of an atom?
A
Neutrons, because they are neutral and spread out through the atom
B
The nucleus (protons and neutrons)
C
The electron cloud (the region where electrons are likely to be found)
D
Protons, because they have the largest mass
Verified step by step guidance1
Recall the basic structure of an atom: it consists of a nucleus at the center, containing protons and neutrons, and electrons that move around the nucleus in a region called the electron cloud.
Understand that the nucleus is very small compared to the entire atom but contains most of the atom's mass because protons and neutrons are much heavier than electrons.
Recognize that electrons occupy a much larger space around the nucleus, forming the electron cloud, which defines the size or volume of the atom.
Note that although neutrons and protons are inside the nucleus, they do not contribute significantly to the atom's volume because the nucleus is extremely compact.
Conclude that the electron cloud, where electrons are likely to be found, makes up most of the volume of an atom, even though it contains very little mass.
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