Chemistry

• An atom is made of up of multiple smaller particles
• The nucleus of an atom is made up of protons and neutrons
• Protons and neutrons have a relative mass of 1
• Electrons are much lighter than protons or neutrons with a mass 2,000 times smaller than theirs
• Protons have a positive charge = +1
• Neutrons have no charge and are therefor neutral = 0
• Electrons have a negative charge = -1
• Atoms have a radius of 0.1 nanometers.
• Most of an atom is empty space because it is measured from the nucleus to the outer electron's orbit
• The nucleus is 10,000 times smaller than the atom
• Atoms are neutral if the number of protons and electrons are the same
• Atoms can lose or gain electrons to form ions.
• The atomic number is the number of protons in the nucleus of an atom.
• The mass number is the total number of protons and neutrons in an atom.
• There is the same amount of electrons as there are protons in an atom
• Protons determine the chemical properties of an atom and are found in the nucleus. (what element an atom is)
• Electrons orbit the nucleus in energy shells