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An atom has a mass number of 210 and an atomic number of 85. How many neutrons does this atom have?
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2. Atoms & Elements
The Atom
Multiple Choice
Which subatomic particle determines the identity of an element?
A
Electrons
B
Neutrons
C
Protons
D
Quarks
검증된 단계별 안내1
Recall that the identity of an element is defined by its atomic number, which is the number of protons in the nucleus of an atom.
Understand that protons carry a positive charge and are located in the nucleus, and each element has a unique number of protons.
Electrons are negatively charged particles that orbit the nucleus and determine chemical behavior but do not define the element's identity.
Neutrons are neutral particles in the nucleus that contribute to the isotope of an element but do not change the element itself.
Quarks are fundamental particles that make up protons and neutrons but are not used to define the identity of an element at the atomic level.
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