A particle IN the atom's nucleus with a neutral (no) charge

A negatively charged particle found in the 'electron cloud'

Matter that is made of only one kind of atom. It is pure.

When an atom is undergoing 'radioactive decay', it may end up changing it's number of protons and become a whole new substance. This is called.....

The smallest part of matter that you can have. Th building block of all matter.

This is how we identify the atom. The atom's 'social security number'. The number of protons in an atom.

The 'positive' end of an electrode (metal that conducts)

The particle IN the nucleus with a positive charge. It gives the atom its identity.

This is where electrons are found outside the nucleus.

This are made of 2 protons and 2 neutrons

The time it takes for half of a chunk of matter to give of its particles of radioactivity.

'An atom with a haircut'. The atom has changed its number of neutrons but NOT the number of protons.

The total mass of the atom (protons + neutrons). Electrons do NOT count because they are too small!i

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