Atomic structure

• an atom is the smallest part of an element that can exist and forms the basis of everything
• A molecule is a particle that consists of two or more atoms of the same element chemically bonded
• A compound is a particle with two or more atoms of different elements chemically bonded together
• A proton has a charge of +1 and a relative mass of 1
• A neutron has a charge of 0 and a relative mass of 1
• An electron has a charge of -1 and a relative mass of 1/1840
• Protons and neutrons are found in the nucleus of an atom, and electrons are found in shells orbiting the neutron
• Atomic number is the number of protons in an element
• Atomic mass is the number of protons plus the number of neutrons in an atom
• An isotope is an atom of the same element with the same number of protons but a different number of neutrons
• Relative atomic mass is the average of the masses of all the isotopes of an element.