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particles with a positive electrical charge; these particles are located in an atom's nucleus
protons
A person who specializes in the branch of science concerned with the physical universe.
physicist
describes something related to an atom
atomic
when you describe how something ______ you say what it does, how it performs, or how it reacts.
behaves
In physics, __________ describes something having to do with charged particles.
electrical
the act of focusing one’s mind or eyes on something.
attention
the physicist who proposed modern atomic theory.
John Dalton
something in the universe, such as oxygen, mercury, or gold, that is made up of one kind of atom.
element
tiny bits of matter
particles
the center of an atom, containing neutrons and protons.
nucleus
describes particles that are smaller than an atom.
subatomic
very tiny bits of matter (particles) with no electrical charge; these particles are located in the center, or nucleus, of an atom.
neutrons
refers to something being done separately or one at a time.
individually
a colorless, odorless, tasteless gas.
hydrogen
a combination of two or more elements.
compound
he and his teacher were the first people to propose that all things are made up of smaller parts called atoms.
Democritus
In physics, ___________ means being related to a negative electrical charge, not a positive electrical charge.
negatively
finally
untimately
particles with a negative electrical charge; these particles occupy the space outside of an atom’s nucleus.
electrons
__________ is made up of all things that exist, including our solar system and beyond.
universe