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Which subatomic particles are found in the space surrounding the nucleus of an atom?
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2. Atoms & Elements
The Atom
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How many neutrons are present in an atom of chlorine-35?
A
35
B
20
C
18
D
17
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Identify the atomic number of chlorine, which is the number of protons in the atom. For chlorine, the atomic number is 17.
Recognize that the number 35 in chlorine-35 represents the mass number, which is the total number of protons and neutrons in the nucleus.
Use the formula to find the number of neutrons: \(\text{Number of neutrons} = \text{Mass number} - \text{Atomic number}\).
Substitute the known values into the formula: \(\text{Number of neutrons} = 35 - 17\).
Calculate the difference to find the number of neutrons in chlorine-35.
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