What is the structure of an atom?

The structure of an atom is made up of three particles: protons, neutrons, and electrons:
Protons: Positively charged particles located in the nucleus
Neutrons: Uncharged particles located in the nucleus
Electrons: Negatively charged particles that orbit the nucleus in shells
The nucleus is a dense, positively charged part of the atom that contains more than 99.9% of its mass, even though it’s usually less than one ten-thousandth the size of the atom.
The arrangement and number of these particles in an atom determine its properties. For example, a hydrogen atom has one proton, one electron, and no neutrons.
To draw an atom structure, you can:
Draw a small circle to represent the nucleus
Write the number of protons and neutrons in the nucleus
Calculate the number of electrons in the atom
Draw the atom’s shells
Fill the shells with the correct number of electrons for the element
The number of protons and neutrons in an atom can be found on the periodic table. The top number is the mass number, which is the sum of the number of protons and neutrons. The bottom number is the atomic number, which is the number of protons.