Structure of the Atom

Front

What is the atomic number of an element?

Back

The atomic number is equal to the number of protons in a single atom of that element.

Front

What does the mass number of an atom represent?

Back

The mass number is the sum of protons and neutrons in the nucleus of an atom.

Front

How does the amount of positive charge in an atom vary?

Back

The amount of positive charge varies with different elements.

Front

What is true about the number of protons and electrons in a neutral atom?

Back

Every neutral atom has the same number of protons and electrons, but they may not have the same number of neutrons.

Front

What is a positively charged particle found in the nucleus called?

Back

A positively charged particle found in the nucleus is called a proton.

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the mass of an atom and help stabilize the nucleus.

Front

What is an isotope?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons.

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.