Atoms Crossword

the smallest piece of an element that still represents that element
a particle with one negative charge
most of an atoms mass and positive charge is concentrated in a small area in the center of the atom
an atomic particle that has one positive charge
a neutral particle that exists in the nucleus of an atom
an area around an atomic nucleus where an electron is most likely to be located.
believed that matter is made of small, solid objects that cannot be divided, created, or destroyed.
believed that all matter is made up of fire, air, water, and earth.
proposed the atomic theory
1981 invention of a high-powered microscope
Made the cathode ray tube
created the gold foil experiment
dense and positively charged particles
discovered that the nucleus also had neutrons
studied hydrogen atoms because they contain only one electron
protons and neutrons are made up of this
a group of particles
gluons and photons are examples of
periodic symbol H
periodic symbol He