Multiple Choice
In a simplified model of the atom, what is the center of an atom called?
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4. Atoms and Elements
The Atom (Simplified)
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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 best describes an atom?
A
The smallest unit of a compound that can exist independently, consisting of two or more atoms chemically bonded
B
A region in an atom where electrons are guaranteed to be found at a fixed distance from the nucleus
C
The smallest unit of an element that retains the element’s chemical identity, consisting of a nucleus (protons and neutrons) surrounded by electrons
D
A positively charged particle found in the nucleus that determines the atomic number
Verified step by step guidance1
Step 1: Understand the definition of an atom. An atom is the fundamental unit of an element that retains the chemical properties of that element.
Step 2: Recognize that an atom consists of a nucleus containing protons and neutrons, with electrons orbiting around the nucleus.
Step 3: Differentiate an atom from a compound. A compound is made of two or more atoms chemically bonded, whereas an atom is a single unit of an element.
Step 4: Note that the atomic number is determined by the number of protons in the nucleus, but the atom itself is not just a single particle; it includes electrons and neutrons as well.
Step 5: Conclude that the best description of an atom is: 'The smallest unit of an element that retains the element’s chemical identity, consisting of a nucleus (protons and neutrons) surrounded by electrons.'
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