The Concept of An Atom Crossword Puzzle

QUESTIONS LIST:

• atom: the smallest particle of an element that retains all the properties of that element.
• compound: a chemical combustion of two or more different elements, can be broken down into simpler substances by chemical means.
• molecule: forms when two or more atoms are chemically bonded and is lower in potential energy than its constituent atoms.
• atomic mass: the weighted average mass of the isotopes of that element. the combined weight of protons and neutrons.
• atomic number: the number of protons in an atom.
• electron: a negatively charged, fast-moving particle with an extremely small mass that is found in all forms of matter and is located on the outside of the nucleus within an atom.
• neutron: a neutral, sub-atomic particle located inside an atom's nucleus that has a neutral charge, 0.
• proton: a sub-atomic particle located inside an atom's nucleus that has a positive charge, +1.
• chemical bond: the force that holds two atoms together; may form by the attraction of a positive ion for a negative ion or by sharing electrons.
• ion: an atom or bonded group of atoms with a positive or negative charge.
• element: a pure substance that cannot be broken down into simpler substances by physical or chemical means.
• democritus: discovered that matter was not infinitely divisible, in (460 - 370 b.c.). this included atoms.
• john dalton: discovered atoms were solid balls in 1803.
• joesph: _ thomson - discovered the inside of atoms had central positive charge were surround by electrons in a soup like way. this discovery was made in 1897.
• rutherford: ernest _ - discovered that in the inside of atoms; electrons rotate around the outside of the nucleus within an atom; like planets rotating around the sun within a solar system, discovered in 1911.
• niels bohr: discovered that in the inside of atoms; electrons have a specific rotation when orienting or moving around the nucleus within an atom in 1913.
• erwin: _ schrodinger - discovered an equation of where an electron may lie within an atom's energy level.
• energy level: the level or energy shell in which an electrons rotates around the outside of a nucleus within an atom.