1. Atomic Theory and Atomic Structure
Chemistry Review
Atomic Theory and Atomic Structure

2. Who am I?

3. Responsible for naming the atom
Dalton
Bohr
Rutherford
Democritus

4. Who am I?

5. I proposed the atomic theory.
Bohr
Rutherford
Chadwick
Dalton
Democritus

6. How was my atomic theory incorrect?
All elements are composed of atoms which are indivisible.
Atoms of the same element are alike.
Compounds form by joining 2 or more elements.

7. Whose model is this?

8. The previous model showed positive and negative charges mixed like “Plum Pudding”
Bohr
Dalton
Thomson
Rutherford

9. Who am I and here is my model

10. Discovered the nucleus had a positive charge with electrons outside of it.
Bohr
Dalton
Rutherford
Thomson

11. Rutherford Gold Foil Experiment
The reflected alpha particles bounced off of the positively charged nucleus – which proved the existence of the nucleus. True or False?
True – alpha particles are positive
The reflected alpha particles bounced off of the atoms in the gold foil – which proved the existence of atoms. True or False?
False

12. Rutherford Gold Foil Experiment
Most of the alpha particles went straight through the gold foil undeflected – which proved that the positive charge was spread out evenly through the atom. True or False
False. Positive would reflect positive.

13. Who am I ?

14. My contribution to the atomic theory development was
Nothing, I was a loser.
Discovered protons.
Placed electrons in specific energy levels.
Discovered neutrons.

15. Who am I ?

16. Who am I and what did I do?
Rutherford and discovered protons and nucleus.
Thompson and discovered electrons.
Chadwick, and discovered neutrons.

17. Why were the neutrons so difficult to detect?
Because they are so massive.
Because they have no charge.
Because they have numerous charges.

18. Subatomic Particles
Particle Symbol Charge Relative Mass Electron e- - 0 Proton p+ + 1 Neutron n neutral 1

19. State the number of protons for Nitrogen

20. State the number of protons for Sulfur

21. State the number of protons for Barium

22. Number of Electrons An atom is neutral The net charge is zero
Number of protons = Number of electrons
Atomic number = Number of electrons

23. Ions – charged atoms
If an ion gains an electron it becomes ______________ charged and is called an _____________.
Answer: negatively anion

24. Ions: charged atoms
If an ion loses an electron , it becomes ____________ charged, and is called a ______________.
Answer: positively, cation

25. An atom of zinc has a mass number of 65. Number of protons in zinc are30 35 65
125

26. The number of neutrons in zinc are30 35 65
125

27. What is the mass number of a zinc isotope with 37 neutrons?65 67
125

28. An atom has 14 protons and 20 neutrons. Its atomic number is16 34
201

29. An atom has 14 protons and 20 neutrons. Its mass number is16 34 8

30. An atoms has 14 protons and 20 neutrons. The element isSi Ca Se
Lol

31. If an element has 12 protons and 12 neutrons, how many electrons are found in the nucleus? A. 12 B. 24 C. Only the ones with lots of energy. D. No electrons are found in nucleus.

32. 17 Ions 37Cl -1 How many protons? How many neutrons?
How many electrons?
Anion or Cation?