객관식
Which of the following is the smallest unit of an element that retains its chemical properties?
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2. Atoms & Elements
The Atom
객관식
Which of the following models best illustrates the basic structure of an atom for teaching purposes?
A
A nucleus containing protons and neutrons, with electrons orbiting in defined energy levels around it
B
A nucleus made only of electrons, with protons and neutrons orbiting around it
C
A cloud of protons and electrons mixed together without any central nucleus
D
A solid sphere with no internal structure
검증된 단계별 안내1
Step 1: Understand the basic components of an atom. An atom consists of a nucleus containing protons and neutrons, and electrons that move around the nucleus.
Step 2: Recognize that protons are positively charged, neutrons have no charge, and electrons are negatively charged. The nucleus is dense and central, while electrons occupy regions around it.
Step 3: Recall that electrons are arranged in defined energy levels or shells around the nucleus, which helps explain atomic behavior and chemical properties.
Step 4: Evaluate the given models: the correct model must have a nucleus with protons and neutrons, and electrons orbiting in energy levels around it.
Step 5: Conclude that the model describing a nucleus containing protons and neutrons, with electrons orbiting in defined energy levels, best illustrates the basic atomic structure for teaching purposes.
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