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Science

Across
Time is takes for half of the original sample of a radioactive isotope to decay
A collection of atoms that all have the same number of protons
The number of protons in an atom
Two or more small nuclei fused to make a bigger nucleus
Electromagnetic radiation
Control the fission in a nuclear reactor
Atom that is not stable
This happens on the sun
Helps you see very tiny things
Helps you see things that are very far away
Device that helps you hear someone that is far away
Down
Center of an atom, containing the protons and neutrons
A machine that converts mechanical energy into electricity
Sum of the number of protons and neutrons in the neucleus
helium nucleus emitted by some radioactive substances.
a fast-moving electron emitted by radioactive decay of substances.
Atoms with the same number of protons, but different number of neutrons
They live in the water
Happens when a lunar eclipse is at its maximum