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Chemistry Whiz Kid

Across
I am necessary for all living things to survive. My nucleus has eight protons!
a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
My atomic number is 5.
My atomic number is 10. You can see me lighting up signs on the highway!
Named after the Norse God of Thunder + -IUM
____, Beta, Gamma, Delta + a minute portion of matter
I am found in medicines. My atomic number is 53.
My atomic number is 49.
Down
My atomic weight is 14.007
My atomic weight is 32.06
A substance that melds two things together minus last letter + opposite of the word OFF
I am a stable isotope. My mass number is 294.
My atomic weight is 183.84
I am a stable isotope. My mass number is 243.
My atomic weight is 137.33.