1. Nitrogen Aluminum Sodium-23 Sodium-25 Quick Question:
Draw Bohr models of the following atoms.
Nitrogen
Aluminum
Sodium-23
Sodium-25

2. 95% Cu

3. Today’s Objective:
I can use Bohr models to represent elements of specific atoms.

9. What happened to the beam when Thomson placed a magnet on either side of the glass tube? What did he discover?
Beam was attracted to positive magnet. Electron

10. Atoms of the same element that have a different
What are isotopes?
Atoms of the same element that have a different
number of neutrons.

11. Gold foil experiment to discovered proton in nucleus.
What experiment did Rutherford complete and what did he contribute to current atomic theory?
Gold foil experiment to discovered proton in nucleus.

12. QQ:
A magnesium atom has 12 protons and 15 neutrons. The Periodic Table shows Magnesium has an atomic mass of Explain how this can be true.

13. 6 protons, 6 electrons, 8 neutrons.
If an atom has an atomic number of 6 and a mass number of 14, how many protons, electrons, and neutrons are in the atom?
6 protons, 6 electrons, 8 neutrons.

14. What did Aristotle believe all matter was made of?

15. What is the charge of an atom with 15 protons, 16 neutrons, and 18 electrons.
Negative 3

16. This is the first scientist that understood that atoms could be combined to form molecules.
John Dalton

17. What happens to an electron when it gains energy?
It moves further
away from nucleus.

18. This scientist discovered the relationship between
the energy an electron
contains and where it can be found in relation to the nucleus.
Bohr

19. Create a Bohr Model for
Argon-30

20. An unknown atom has 15 protons and an atomic mass of 34
An unknown atom has 15 protons and an atomic mass of 34. What is this element? How many electrons and neutrons does it have?

21. On the Periodic Table of Elements, how is the atomic mass number of an element calculated?
It is the average weighted mass of all atoms found in nature.

22. What are valance electrons?
Electrons found in the outer energy orbital.

23. Which characteristic of an atom always varies from element to element?
It’s number of protons.