Question

1. carbon - 14 has an atomic number of 14 and has 14 protons.

matching

1. atom
2. nucleus
3. atomic mass
4. atomic mass unit (amu)
5. mass number
6. atomic number

a. the weighted average mass of an elements isotopes
b. the central part of an atom, containing protons and neutrons.
c. the total number of protons and neutrons in an atoms nucleus.
d. the basic unit of matter that retains the properties of an element.
e. a unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of a carbon - 12 atom.
f. the total number of protons in an atoms nucleus

Explanation:

• 1. Atom: By definition, an atom is the basic unit of matter that retains the properties of an element. So it matches with D.
• 2. Nucleus: The nucleus is the central part of an atom which contains protons and neutrons. So it matches with B.
• 3. Atomic Mass: Atomic mass is the weighted - average mass of an element's isotopes. So it matches with A.
• 4. Atomic Mass Unit (amu): amu is a unit of mass used to express atomic and molecular weights, equal to one - twelfth of the mass of a carbon - 12 atom. So it matches with E.
• 5. Mass Number: The mass number is the total number of protons and neutrons in an atom's nucleus. So it matches with C.
• 6. Atomic number: The atomic number is the total number of protons in an atom's nucleus. So it matches with F.

Answer:

1. D. The basic unit of matter that retains the properties of an element.
2. B. The central part of an atom, containing protons and neutrons.
3. A. The weighted average mass of an element's isotopes
4. E. A unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of a carbon - 12 atom.
5. C. The total number of protons and neutrons in an atom's nucleus.
6. F. The total number of protons in an atom's nucleus