Atomic Mass Number Worksheet
A Grade 12 Chemistry worksheet focusing on understanding and calculating atomic mass number, isotopes, and average atomic mass.
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Atomic Mass Number Worksheet
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Read each question carefully and provide detailed answers. Show all calculations where applicable. Refer to the periodic table as needed.
1. The atomic mass number (A) represents the total number of and in an atom's nucleus.
2. Isotopes are atoms of the same element that have the same number of but a different number of .
3. The average atomic mass of an element is a weighted average of the masses of its naturally occurring .
1. An atom has 6 protons, 6 electrons, and 8 neutrons. What is its atomic mass number?
6
12
14
20
2. Which of the following statements about atomic mass number is correct?
It is always equal to the number of protons.
It is the sum of protons and electrons.
It can vary between isotopes of the same element.
It is represented by the letter Z.
1. Explain the difference between atomic number and atomic mass number.
2. Calculate the average atomic mass of element X, which has two isotopes: X-35 (mass = 34.968 amu, abundance = 75.77%) and X-37 (mass = 36.966 amu, abundance = 24.23%).
1. All atoms of a given element have the same atomic mass number.
True
False
2. The mass of an electron is significantly greater than the mass of a proton.
True
False