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Chapter 3: Problem 95

The mass number of a neutral atom is 19 , and its atomic number is 9 . The atom contains how many protons, electrons, and neutrons?

Short Answer

Expert verified
The neutral atom with a mass number of 19 and an atomic number of 9 contains 9 protons, 9 electrons, and 10 neutrons.

Step by step solution

01

Recall the definitions of mass number and atomic number

The mass number, denoted as "A," is the total number of protons and neutrons in an atom's nucleus. The atomic number, denoted as "Z," represents the number of protons in the atom. In our exercise, we have: Mass number (A) = 19 Atomic number (Z) = 9
02

Determine the number of protons

Since the atomic number is equal to the number of protons in an atom, we have: Number of protons = \(Z = 9\)
03

Determine the number of electrons

In a neutral atom, the number of electrons is equal to the number of protons, so we have: Number of electrons = Number of protons = 9
04

Determine the number of neutrons

Since the mass number is the sum of protons and neutrons, we can find the number of neutrons by subtracting the number of protons from the mass number: Number of neutrons = Mass number (A) - Number of protons (Z) Number of neutrons = \(19 - 9 = 10\)
05

Final Answer

The neutral atom with a mass number of 19 and an atomic number of 9 contains: - 9 protons - 9 electrons - 10 neutrons

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