Atomic Theory Unit

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is a neutron?

Back

A neutron is a subatomic particle found in the nucleus of an atom, with no electric charge.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus.

Front

How do you calculate the number of neutrons in an atom?

Back

Number of neutrons = Mass number - Atomic number.

Front

What is the Bohr model of the atom?

Back

The Bohr model describes the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits.

Front

What is the difference between an atom and an ion?

Back

An atom is neutral, while an ion has a net electric charge due to the loss or gain of one or more electrons.

Front

What is a proton?

Back

A proton is a positively charged subatomic particle found in the nucleus of an atom.

Front

What is the significance of isotopes?

Back

Isotopes are variants of the same element that have the same number of protons but different numbers of neutrons, affecting their mass.

Front

What is the nuclear symbol for an isotope?

Back

The nuclear symbol is written as A/Z X, where A is the mass number, Z is the atomic number, and X is the chemical symbol.

Front

What is the Cloud Model of the atom?

Back

The Cloud Model describes electrons as existing in a cloud-like region around the nucleus, representing areas of probability rather than fixed orbits.