1. Last Name of the Person Who Discovered the Neutron

Chemistry-GName:

Review sheet: Ch 4: obj 1-12Date:

Across

1. last name of the person who discovered the neutron

5. a form of an atom of an element that differs from other atoms of that element by the number of neutrons

6. a positively charged particle found in the nuclei of atoms

8. the average mass of an atom of an element

11. a negatively charged particle that makes up most of the volume of atoms

12. last name of the person who determined that electron can only be certain distances from the nucleus

13. a neutral particle found in the nuclei of atoms

14. the units used to measure the mass of atoms

15. a type of substance made up of only one kind of atom

Down

2. the number that defines an element and indicates how many protons are in the nucleus of an atom of that element

3. last name of the person who first established the atomic theory

4. the ______model of the atom is the most accepted model of the atom today

7. last name of the person who discovered the nucleus

9. last name of the person who discovered the electron

10. the smallest unit of an element that retains the properties of that element

B. Matching

_____16. Thomson’s atomic model

_____ 17. Rutherford’s atomic model

_____ 18. Bohr’s atomic model

_____ 19. Dalton’s atomic model

_____ 20. Quantum mechanical model

C. Matching

_____ 21. Symbol

_____ 22. Mass number

_____ 23. Atomic number

_____ 24. Electron configuration

_____ 25. Atomic mass

26. Complete the following table:

Atomic number / Mass Number / Number of protons / Number of neutrons / Number of electrons / Atomic Symbol
15 / 16
80 / 35
35 / 18
10 / 12

D. Answer true or false

_____ 27. Electrons and protons have a mass of one amu.

_____ 28. Neutrons and protons are found in the nucleus.

_____ 29. The nucleus makes up most of the mass of an atom.

_____ 30. The electrons make up most of the volume of an atom.

_____ 31. decays to form . The type of radioactive decay observed is

A. a neutronB. an alpha particle

C. a beta particleD. a gamma particle

_____ 32. What particle forms by the alpha capture of samarium-154 (at. No. 64).

a. b. c. d. e.

_____ 33. What particle forms by the neutron decay of einsteinium-256 (at. No. 99).

a. b. c. d. e.