1. Bell work – what is an atom?
Particle that makes up all matter.

2. Smallest unit that still has the properties of the element.
1) What is an atom?
Smallest unit that still has the properties of the element.
What does atom really mean?
indivisible or uncuttable

3. Proton Neutron Electron
2) What makes up an atom?
Proton
Neutron
Electron

4. 3) What is a subatomic particle?
Particles that make up the atom

5. Number of protons equals the number of electrons
4) Why are atoms neutral?
Number of protons equals the number of electrons

6. 5) Describe the following:
Atomic number –
Atomic mass –
Proton –
Neutron –
Electron –
Number of protons
Number of protons and neutrons
Positive
Where is it located? Where is it located? Where is it located?
Nucleus
Neutral
Nucleus
Negative
Outside

7. 6) What is a Valence electron?
Electron in the outer shell; bonding electrons

8. 7) What is an Isotope?
Atoms of the same element that have different mass/different # neutrons

9. 8) What subatomic particle has about the same mass a proton, but with no charge?
neutron

10. 9) What subatomic particle has about the same mass a proton, but with no charge?
electron

11. 10) What subatomic particles are found in the nucleus?
Proton and neutron

12. 11) Isotopes of an element contain different numbers of which subatomic particles?
neutron

13. Mass - protons = neutrons
oxygen 8 8 8 16 8
nitrogen 7 7 7 14 7 6 6 C 6 12 6 18 22 18
Argon 18 40 K 19 20 39 19
Potassium Fe
Iron 26 26 30 56
Fluorine 9 10 19 9