Question

subatomic particles

1. for an atom of carbon (c) with an atomic number of 6 and a mass number of 12, identify the number of

a. protons;
b. neutrons;
c. electrons;

1. for an atom of lead (pb) with an atomic number of 82 and a mass number of 207, identify the number of

a. protons;
b. neutrons;
c. electrons;

1. for an atom of gold (au) with an atomic number of 79 and a mass number of 197, identify the number of

a. protons;
b. neutrons;
c. electrons;

Explanation:

Step1: <Define atomic number and mass number>

Atomic number \(Z\) = number of protons = number of electrons (in neutral atom). Mass number \(A\) = number of protons + number of neutrons. So, number of neutrons \(N=A - Z\).

Step2: <Calculate for Carbon (C)>

• a. Protons: \(Z = 6\)
• b. Neutrons: \(N=A - Z=12 - 6 = 6\)
• c. Electrons: \(Z = 6\)

Step3: <Calculate for Lead (Pb)>

• a. Protons: \(Z = 82\)
• b. Neutrons: \(N=A - Z=207 - 82 = 125\)
• c. Electrons: \(Z = 82\)

Step4: <Calculate for Gold (Au)>

• a. Protons: \(Z = 79\)
• b. Neutrons: \(N=A - Z=197 - 79 = 118\)
• c. Electrons: \(Z = 79\)

Answer:

1.

• a. 6
• b. 6
• c. 6

2.

• a. 82
• b. 125
• c. 82

3.

• a. 79
• b. 118
• c. 79