Examlex
Which part of the brain regulates balance and coordination?
Nucleus
The center or middle.
Atom Contains
Atoms consist of a nucleus made of protons and neutrons, surrounded by electrons in orbital shells.
Atomic Number
The atomic number is equal to the number of protons (positively charged particles) in the nucleus of an atom.
Element
A pure chemical substance consisting of one type of atom distinguished by its atomic number.
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