Multiple Choice
What is the mass number for an atom of calcium containing 20 protons and 25 neutrons?
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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
In an atom, what do electrons do in relation to protons and neutrons?
A
Electrons are stationary and do not move around protons and neutrons.
B
Electrons orbit around the nucleus, which contains protons and neutrons.
C
Electrons repel protons and neutrons out of the atom.
D
Electrons are located inside the nucleus with protons and neutrons.
Verified step by step guidance1
Understand the structure of an atom: it consists of a nucleus containing protons and neutrons, and electrons that exist outside the nucleus.
Recall that protons have a positive charge, neutrons have no charge (neutral), and electrons have a negative charge.
Recognize that electrons are not stationary; instead, they move around the nucleus in regions called orbitals or energy levels.
Know that electrons are attracted to the positively charged protons in the nucleus due to electrostatic forces, which keeps them in orbit around the nucleus.
Conclude that electrons do not repel protons and neutrons out of the atom, nor are they located inside the nucleus; rather, they orbit the nucleus containing protons and neutrons.
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