P4 Radioactivity Crossword

This printable crossword puzzle on the topic of Physics has 18 clues. Answers range from 4 to 19 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

Used to measure radioactivity.
Type of radiation blocked by paper
The most penetrating form of radiation
Rutherford did this to discover the nucleus
Bohr proposed this model of the atom.
Same element with different number of neutrons.
A high speed electron.
What is gamma radiation
When a radioactive source is in an object
measurement of radioactivity
Time for half the nuclei to decay
reading from a Geiger counter.
radioactive decay is...
radioactive nuclei are...
process where an atom become charged
positively charged subatomic particles
subatomic particle with zero mass
electrons are arranged in these within the atom