Question

complete the following questions using your periodic table. if you have questions, ask a partner or your teacher.
vocabulary review

1. what is the atomic number?
2. what is the mass number?
3. what is an isotope?
4. what does the mass on the periodic table tell you?
5. how can you tell different isotopes apart? (what are the two notations?)

Explanation:

1. The atomic number is the number of protons in the nucleus of an atom. It determines the element's identity.
2. The mass number is the total number of protons and neutrons in the nucleus of an atom.
3. An isotope is an atom of an element with the same atomic number but a different mass number (i.e., different number of neutrons).
4. The mass on the Periodic Table is the average atomic mass of all the isotopes of an element, weighted by their natural abundance.
5. Different isotopes can be told apart by their mass numbers. In notation, isotopes are often written as \( \text{Element}_{A}^{Z} \), where \( Z \) is the atomic number and \( A \) is the mass number. For example, carbon - 12 (\( ^{12}_{6}\text{C} \)) and carbon - 14 (\( ^{14}_{6}\text{C} \)) are isotopes of carbon. The difference in their mass numbers (\( 12\) vs \( 14\)) indicates the difference in the number of neutrons (\( 12 - 6=6\) neutrons for \( ^{12}_{6}\text{C}\) and \( 14 - 6 = 8\) neutrons for \( ^{14}_{6}\text{C}\)).

Answer:

1. The number of protons in the nucleus of an atom.
2. The total number of protons and neutrons in the nucleus of an atom.
3. An atom of an element with the same atomic number but a different mass number (different number of neutrons).
4. The average atomic mass of all the isotopes of an element, weighted by their natural abundance.
5. By their mass numbers. In notation, isotopes are written as \( \text{Element}_{A}^{Z} \), where \( Z \) (atomic number) is the same for the element, and \( A \) (mass number) differs.