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Chapter 1: Problem 9

How is the mass number, A, (left-hand superscript next to the atomic symbol as shown in the Model) determined (from the structure of the atom)?

Short Answer

Expert verified
The mass number (A) is determined by the sum of the number of neutrons and protons in an atom's nucleus.

Step by step solution

01

Identify the Number of Protons

The number of protons in an atom corresponds to the atomic number of the element. The atomic number can be found in the Periodic Table where each element has its own atomic number.
02

Identify the Number of Neutrons

Determine the number of neutrons in the atom. The number of neutrons is often given in the problem. If it isn't, and you have the mass number already, you can subtract the atomic number (number of protons) from the mass number to get the number of neutrons.
03

Calculate the Mass Number

The mass number (A) of an atom is found by adding together the number of protons and neutrons in the atom. Mass Number (A) = Number of Protons + Number of Neutrons. Compute these values to find the mass number.

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