Multiple Choice
Did Dmitri Mendeleev know about the existence of the atomic nucleus when he developed the periodic table?
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2. Atoms & Elements
Atomic Theory
Multiple Choice
According to the modern concept of the atom, which statement is correct?
A
Atoms are indivisible and cannot be broken down further.
B
Electrons occupy specific energy levels around the nucleus.
C
Neutrons orbit the nucleus in fixed paths.
D
Protons and electrons are both found in the nucleus.
Verified step by step guidance1
Understand the modern concept of the atom, which is based on quantum mechanics and atomic theory developed after the discovery of subatomic particles.
Recall that atoms are composed of a nucleus containing protons and neutrons, with electrons occupying regions around the nucleus called energy levels or orbitals.
Recognize that the statement 'Atoms are indivisible and cannot be broken down further' is outdated because atoms can be split into subatomic particles.
Know that neutrons do not orbit the nucleus; instead, they reside within the nucleus along with protons.
Identify that electrons do not orbit in fixed paths like planets but occupy specific energy levels or orbitals around the nucleus, which is the correct modern understanding.
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