Atoms

Atoms

1. Atomic Number is the bottom number

   • Number of protons (positive)
     • Number of electrons (negative)

2. Atoms have protons neutrons and electrons

   • The nucleus is located at the center
     • Its made of protons and neutrons
   • Electrons move around the nucleus
   • The neutrons in the atom have no charge,

3. Mass number equals the top number

   • Its the sum of the protons and neutrons
     • The number of neutrons is the difference between the mass and the atomic number

4. Isotopes are the ones which have a different number of neutrons. They have the same atomic number, but a different mass number

5. When atoms join together, they form compounds

   • You can take, give away or share electrons.
     • Metals and non-metals compounds consist of ions
       • Covalent bonding
       • Ionic bonding

6. Elements are atoms which have the same atomic number

   • They are 100 different elements
   • The number of protons tells what atom it is.
     • They can have a different number of electrons or neutrons but not protons.
   • They are represented in the periodic table.