Atomic Structure and Nuclear Radiation Crossword Puzzle

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QUESTIONS LIST:

isotope: an atom of the same element with the same number of protons, but a different number of neutrons
plum pudding: the model that shows an atom to be a large sphere of positive charge with electrons dotted inside it
ground state: the lowest energy level or state of an atom
alpha: a type of radiation consisting of helium nuclei
beta plus: a radiation that emits a positron
half life: the time it takes for the number of radioactive nuclei to half
background radiation: the ionizing radiation that is always present in the environment
radon: the gas that is the result of the decay of uranium rocks, which diffuses into the air
becquerel: the unit for radioactive activity
activity: the number of nuclei that decay per unit time of a radioactive sample