Multiple Choice
Electrons are the negatively charged particles of atoms. Where are they located?
2. Atoms & Elements
The Atom
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following statements correctly describes the atomic number of an element?
A
The atomic number is the total number of protons and neutrons in an atom.
B
The atomic number is the number of protons in the nucleus of an atom.
C
The atomic number is the average mass of an atom's isotopes.
D
The atomic number is the number of electrons in a neutral atom.
Verified step by step guidance1
Understand the concept of atomic number: The atomic number of an element is a fundamental property that defines the element. It is represented by the symbol Z.
Identify the correct definition: The atomic number is the number of protons in the nucleus of an atom. This is a unique identifier for each element.
Clarify common misconceptions: The atomic number is not the total number of protons and neutrons, which is the mass number. It is also not the average mass of an atom's isotopes, which is related to atomic mass.
Relate atomic number to electrons: In a neutral atom, the number of electrons is equal to the number of protons, hence the atomic number also indirectly indicates the number of electrons.
Apply the concept: Knowing the atomic number allows you to determine the element's position in the periodic table and its chemical properties.
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