Fill in the gaps in the following table, assuming each column represents a neutral atom.
Symbol ⁷⁹Br
Protons 25 82
Neutrons 30 64
Electrons 48 86
Mass no. 222 207




Complete the second row of the table excluding the row with isotope symbol.

Key Concepts

Atomic Structure

Atoms consist of protons, neutrons, and electrons. Protons and neutrons are located in the nucleus, while electrons orbit around the nucleus. The number of protons defines the element, while the total number of protons and neutrons gives the atomic mass. Understanding atomic structure is essential for filling in the gaps in the table, as it helps identify the relationships between these subatomic particles.

Isotopes

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons. This results in different atomic masses for the isotopes. In the context of the question, recognizing that the symbol 79Br refers to a bromine isotope with 79 nucleons (protons + neutrons) is crucial for accurately completing the table and understanding the properties of the elements involved.

Mass Number

The mass number of an atom is the total count of protons and neutrons in its nucleus. It is represented as the upper left superscript in the isotope notation (e.g., 79 in 79Br). This concept is vital for completing the table, as it allows for the calculation of missing values by using the known number of protons and neutrons to derive the mass number and ensure the atomic neutrality by balancing protons and electrons.