Multiple Choice
Which of the following is the smallest particle of an element that retains the chemical properties of that element?
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2. Atoms & Elements
The Atom
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How many neutrons are present in a neutral atom of fluorine (F) with atomic number 9 and mass number 19?
A
18
B
10
C
19
D
9
Verified step by step guidance1
Identify the atomic number (Z) of fluorine, which is given as 9. The atomic number represents the number of protons in the nucleus of the atom.
Identify the mass number (A) of the fluorine atom, which is given as 19. The mass number is the total number of protons and neutrons in the nucleus.
Recall that the number of neutrons (N) in an atom can be found by subtracting the atomic number from the mass number using the formula: \(N = A - Z\).
Substitute the given values into the formula: \(N = 19 - 9\).
Calculate the difference to find the number of neutrons in the fluorine atom.
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