Complete the following statements:
a. The number of protons and neutrons in an atom is also the _____ number.

Verified step by step guidance

1. Understand that the number of protons in an atom is referred to as the atomic number, which identifies the element.
2. Recognize that the number of neutrons can vary in atoms of the same element, leading to isotopes.
3. Learn that the sum of the protons and neutrons in an atom is called the mass number, which represents the total number of nucleons in the nucleus.
4. Recall that the mass number is not the same as the atomic mass, which is a weighted average of all isotopes of an element.
5. Conclude that the blank in the statement should be filled with 'mass' to complete the phrase 'mass number.'

Key Concepts

Atomic Number

The atomic number is the number of protons found in the nucleus of an atom. It uniquely identifies an element and determines its position on the periodic table. For example, hydrogen has an atomic number of 1, meaning it has one proton.

Mass Number

The mass number is the total number of protons and neutrons in an atom's nucleus. It is not the same as atomic number, as it accounts for both types of nucleons. For instance, a carbon atom with 6 protons and 6 neutrons has a mass number of 12.

Nucleons

Nucleons are the particles found in the nucleus of an atom, specifically protons and neutrons. They are responsible for the atomic mass and stability of the atom. Understanding nucleons is essential for grasping concepts related to atomic structure and nuclear reactions.