Radioactivity
Name: ______________________ Date: ____________
Write the letter of the matching definition next to each term.
1. alpha
A. An elementary particle with negative charge
2. geiger
B. The 2nd letter of the Greek alphabet
3. shell
C. Highly or violently reactive
4. beta
D. A stable particle with positive charge equal to the negative charge of an electron
5. counter
E. Serious disease where cells grow out of control
6. gamma
F. Lacking any definite plan or order or purpose
7. nucleus
G. Ammunition consisting of a cylindrical metal casing containing an explosive charge and a projectile
8. cancer
H. An elementary particle with 0 charge and mass about equal to a proton
9. decay
I. German physicist who developed the ___ counter
10. unstable
J. The 1st letter of the Greek ___
11. random
K. A unit of magnetic field strength equal to one-hundred-thousandth of an oersted
12. proton
L. A calculator that keeps a record of the number of times something happens
13. deflect
M. To prevent the occurrence of
14. neutron
N. The organic phenomenon of rotting
15. electron
O. Center of an atom or a cell