Multiple Choice
How many neutrons are in a typical lithium atom with an atomic mass of 7?
2. Atoms & Elements
Isotopes
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How many neutrons are in an atom of sodium with a mass number of 23?
A
23
B
12
C
11
D
22
Verified step by step guidance1
Understand the concept of mass number: The mass number of an atom is the sum of the number of protons and neutrons in the nucleus. It is represented by the symbol A.
Identify the atomic number of sodium: Sodium (Na) has an atomic number of 11, which means it has 11 protons.
Use the formula to find the number of neutrons: The number of neutrons can be calculated using the formula: \( \text{Number of neutrons} = \text{Mass number} - \text{Atomic number} \).
Substitute the known values into the formula: For sodium with a mass number of 23, substitute the values into the formula: \( \text{Number of neutrons} = 23 - 11 \).
Perform the subtraction to find the number of neutrons: Calculate \( 23 - 11 \) to determine the number of neutrons in the sodium atom.
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