Question

use this completion exercise to check your understanding of the concepts and terms that are introduced in this section. each blank can be completed with a term, short phrase, or number. the number of 1 in the nucleus of an atom is the atomic 2 of that element. because atoms are electrically neutral, the number of protons and 3 in an atom are equal. the total number of 4 and neutrons in an atom is the mass number. atoms of the same element are identical in most respects, but they can differ in the number of 5 in the nucleus. atoms that have the same number of protons but different mass numbers are called 6. the 7 of an element is the weighted average of the masses of the isotopes of that element. each of the three known isotopes of hydrogen has 8 proton(s) in the nucleus. the most common hydrogen isotope has 9 neutrons. it has a mass number of 10 and is called hydrogen - 1.

Explanation:

1. Protons are in the nucleus and determine atomic number.
2. The number of protons defines atomic number.
3. Atoms are neutral, so proton and electron numbers are equal.
4. Mass number is sum of protons and neutrons.
5. Isotopes of same - element have different neutron numbers.
6. Atoms with same protons, different mass numbers are isotopes.
7. Atomic mass is weighted average of isotope masses.
8. Hydrogen isotopes all have 1 proton.
9. Most common hydrogen isotope has 0 neutrons.
10. Its mass number is 1.

Answer:

1. protons
2. number
3. electrons
4. protons
5. neutrons
6. isotopes
7. atomic mass
8. 1
9. 0
10. 1