Atomic Structure, Elements, Periodic Table

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 are subatomic particles that have a negative charge?

Back

Electrons are subatomic particles that have a negative charge.

Front

How do you calculate the mass number of an atom?

Back

The mass number is calculated by adding the number of protons and neutrons in the nucleus of an atom.

Front

What is the mass number of an atom with 20 neutrons and 19 protons?

Back

The mass number is 39 (19 protons + 20 neutrons).

Front

Which element has a mass number of 16?

Back

Oxygen has a mass number of 16.

Front

What is the significance of the periodic table's groups?

Back

Elements in the same group have similar chemical properties due to having the same number of valence electrons.

Front

What is the difference between atomic number and mass number?

Back

The atomic number is the number of protons, while the mass number is the total number of protons and neutrons.

Front

What is a neutron?

Back

A neutron is a subatomic particle found in the nucleus of an atom that has no charge.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances and is defined by its atomic number.

Front

What is the role of protons in an atom?

Back

Protons determine the atomic number and identity of an element.