Atomic Models
What does the greek word atomos mean?
Atom
The way a mineral reflects light from its surface.
Luster
A horizontal row of elements in the periodic table.
Period
Makes up 90% of the universe.
Hydrogen
An element that has some characteristics of both metals and nonmetals.
Metalloid
The three particles found in atoms.
Neutrons, protons and electrons
The gradual wearing away of a metal element due to a chemical reaction.
Corrosion
The columns in the periodic table.
Group/family
The most reactive element on the periodic table.
Fluorine
The most common metalloid
Silicon
The person to develop the first accepted atomic model; believed atoms were smooth, hard spheres
Dalton
Elements in group 3 through 12; including copper, iron, nickel, gold and silver.
Transition metals
A one- or two- letter representation of an element
Chemical symbol
A molecule consisting of two atoms
Diatomic molecule
Their conductivity can be dependent on...
Temperature, light exposure, and the presence of impurities
Fired particles at gold foil and discovered the nucleus.
Rutherford
Highly reactive elements found in group 1 of the periodic table.
Alkali metals
The average mass of all the isotopes of an element
Atomic mass
The elements in group 18 that are nonreactive
Noble gases
Substances that can conduct electric current under some conditions but not others
Semiconductors
A region of an atom in which electrons of the same energy are likely to be found.
Energy level
The elements found after uranium
Transuranium metals
What characteristic of an element determines its place in the periodic table?
Atomic number
What are the six nonmetal families.
Carbon, nitrogen, oxygen, halogens, noble gases and hydrogen
What properties define metalloids?
Brittle, hard, and somewhat reactive