Multiple Choice
In Mendeleev's first widely accepted periodic table, how were the elements primarily arranged?
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4. Atoms and Elements
Atomic Theory
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Atomic Theory: Which property is the same for all atoms of a given element?
A
Number of neutrons in the nucleus
B
Number of protons in the nucleus (atomic number)
C
Number of electrons (in all situations)
D
Mass number
Verified step by step guidance1
Understand that an element is defined by its atomic number, which is the number of protons in the nucleus of its atoms.
Recognize that while the number of neutrons can vary among atoms of the same element (these variations are called isotopes), the number of protons remains constant.
Note that the number of electrons can change if the atom is ionized, so it is not always the same for all atoms of an element.
Recall that the mass number is the sum of protons and neutrons, so it can vary due to different numbers of neutrons in isotopes.
Therefore, the property that is the same for all atoms of a given element is the number of protons in the nucleus, also known as the atomic number.
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