객관식
Copper has two naturally occurring isotopes: copper-63 and copper-65. How many neutrons are present in an atom of copper-65?
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2. Atoms & Elements
Isotopes
Multiple Choice
How many electrons are present in a neutral atom of the isotope silicon-29?
A
15
B
29
C
14
D
16
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검증된 단계별 안내1
Identify the element in question, which is silicon. The atomic number of silicon (Si) is 14, meaning it has 14 protons in its nucleus.
Recall that in a neutral atom, the number of electrons equals the number of protons to balance the positive charge of the nucleus.
Understand that the isotope number (29 in silicon-29) represents the sum of protons and neutrons in the nucleus, not the number of electrons.
Since the atomic number is 14, the number of electrons in a neutral silicon-29 atom is also 14.
Therefore, the isotope number does not affect the electron count; it only affects the neutron count.
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