atoms

Cards (19)

  • atoms contain protons , neutrons and electrons
  • the nucleus is in the middle of the cell
  • nucleus contains protons and neutrons
  • nucleus has a positive charge due to protons
  • electrons are in shells around the nucleus
  • electrons have a negative charge
  • electrons mass is very small
  • neutrons have a neutral charge
  • neutrons have a mass of 1
  • protons have a positive charge
  • protons mass is 1
  • atoms have no overall charge as number of protons and electrons is equal
  • mass number= number of protons + number of neutrons
  • atomic number tells u the amount of protons
  • amount of protons= amount of electrons
  • compounds are substances that are made up of two or more elements chemically combined
  • an element is substance made up of only one type of atom, e.g. hydrogen
  • a mixture is a substance that contains two or more different elements or compounds that are not chemically combined
  • isotopes are different forms of the same element with the same number of protons but different number of neutrons