Elements and Atoms

Elements and Atoms

1. Elements: pure substances that have specific properties at certain temperatures and react in certain ways

2. Atom: most basic part of any element

   • Proton: subatomic particle that defines the element, has a positive charge
     • Atomic Number: number of protons
   • Electron: a subatomic particle in an electron cloud that can change, has a negative charge
     • Ion: charged atom with more or less electrons
   • Neutrons: in the nucleus, are neutral charge and subatomic particles
     • Isotope: an atom with more or less neutrons {different masses}
   • Nucleus: contains protons and neutrons, center of atom
     • Mass Number: Protons + Neutrons