1. The Atom

2. An atom refresher An atom has three parts: - proton -neutron -electron
Proton = positive
The proton is found in the center of the atom, a place called the nucleus.
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3. An atom refresher Neutron = no charge
The neutron is also found in the nucleus.
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4. An atom refresher Electron = negative
The electron is located outside the nucleus in shells which orbit the nucleus
Mass of an electron is about 1000 times smaller than a proton.
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5. O Oxygen Periodic Table Atomic Number:
Number of protons and it is also the number of electrons in an atom. 8 O
Oxygen 16

6. O Oxygen Periodic Table 8
Element’s Symbol: An abbreviation for the element. O
Oxygen 16

7. Periodic Table 8 O
Oxygen
Elements Name 16

8. O Oxygen Periodic Table 8 Atomic Mass/Weight:
Number of protons + neutrons. 16

9. Practice!!!! 3 Li
Lithium 7

10. Practice!!!! 11 Na
Sodium 23