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 fifth row of the table.

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Identify the missing information for the fifth row: the symbol, protons, neutrons, electrons, and mass number.

Use the given mass number (207) and the number of neutrons (64) to find the number of protons: Mass number = Protons + Neutrons, so Protons = Mass number - Neutrons.

Since the atom is neutral, the number of electrons equals the number of protons.

Use the number of protons to determine the element's symbol by referring to the periodic table.

Fill in the missing information in the table: symbol, protons, neutrons, electrons, and mass number.

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Atomic Structure

Atoms consist of protons, neutrons, and electrons. Protons are positively charged particles found in the nucleus, while neutrons are neutral particles also located in the nucleus. Electrons are negatively charged and orbit the nucleus. The number of protons defines the element, while the total number of protons and neutrons gives the atomic mass.

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02:10

Atom Structure

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. For example, bromine-79 (79Br) has 35 protons and 44 neutrons, while another isotope may have a different neutron count, affecting its mass number.

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04:36

Isotopes

Mass Number

The mass number of an atom is the sum of its protons and neutrons. It is a whole number that represents the total mass of the nucleus. In the context of the table, filling in the mass number requires adding the number of protons and neutrons for each atom, which helps in identifying the specific isotope and its properties.

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