Multiple Choice
Which number is equal to the number of protons in an atom?
2. Atoms & Elements
The Atom
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Which of the following statements regarding atoms is true?
A
Atoms are indivisible and cannot be broken down into smaller particles.
B
Atoms are always electrically charged.
C
Atoms of the same element can have different numbers of neutrons.
D
Atoms of different elements have the same number of protons.
Verified step by step guidance1
Understand the historical context: The idea that atoms are indivisible dates back to early atomic theory, but modern science has shown that atoms can be divided into subatomic particles: protons, neutrons, and electrons.
Consider the electrical charge of atoms: Atoms are generally neutral, meaning they have an equal number of protons (positively charged) and electrons (negatively charged). They are not always electrically charged.
Explore isotopes: Atoms of the same element can have different numbers of neutrons, which are called isotopes. This means that while they have the same number of protons, their mass numbers differ.
Examine atomic structure: Atoms of different elements have different numbers of protons, which is what defines each element. The number of protons in the nucleus of an atom is called the atomic number.
Evaluate the statements: Based on the above explanations, the statement 'Atoms of the same element can have different numbers of neutrons' is true, as it describes isotopes. The other statements are false based on modern atomic theory.
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