To calculate the atomic mass of chlorine-35, you need to consider the mass of its protons, neutrons, and electrons.
Chlorine-35 has an atomic number of 17, which means it has 17 protons in its nucleus. Since the atomic mass is the sum of protons and neutrons, we need to find the number of neutrons.
Chlorine-35 is a specific isotope of chlorine, and the number 35 in its name represents its mass number, which is the sum of protons and neutrons.
Since the atomic number is 17, we subtract it from the mass number to find the number of neutrons:
Number of neutrons = Mass number - Atomic number = 35 - 17 = 18
Therefore, chlorine-35 has 17 protons, 18 neutrons, and 17 electrons.
To calculate the atomic mass, you multiply the number of each particle by its respective mass and sum them up:
Atomic mass = (Number of protons * Mass of proton) + (Number of neutrons * Mass of neutron) + (Number of electrons * Mass of electron)
Using the known masses of protons, neutrons, and electrons:
Atomic mass = (17 * mass of proton) + (18 * mass of neutron) + (17 * mass of electron)
The masses of protons, neutrons, and electrons are approximately:
Mass of proton = 1.007276 amu (atomic mass units) Mass of neutron = 1.008665 amu Mass of electron = 0.0005486 amu
Substituting these values into the equation:
Atomic mass ≈ (17 * 1.007276 amu) + (18 * 1.008665 amu) + (17 * 0.0005486 amu)
Calculating the sum:
Atomic mass ≈ 17.083392 amu + 18.15597 amu + 0.0093234 amu ≈ 35.2486854 amu
Rounded to the appropriate number of decimal places, the atomic mass of chlorine-35 is approximately 35.45 amu.