Atomic structure

(physics and chemistry) the smallest component of an element having the chemical properties of the element

a substance that cannot be separated or broken down into simpler substances by chemical means

an electron, proton, or neutron; one of the three major particles of whoch atoms are composed

a stable particle with positive charge equal to the negative charge of an electron

an elementary particle with 0 charge and mass about equal to a proton

negatively charged particle; located outside the atomic nucleus

The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element

the sum of the number of neutrons and protons in an atomic nucleus

the weighted average of the atomic masses of the naturally occurring isotopes of an element

the positively charged dense center of an atom

A region around the nucleus of an atom where electrons are likely to be found

one of two or more atoms with the same atomic number but with different numbers of neutrons

electrons that have the highest energy level

Greek philosopher who developed an atomistic theory of matter (460-370 BC)

a measure of mass for atoms and subatomic particles; the same as the atomic mass unit, or amu.

1897: discovered small particles in the atom. Used a cathode-ray tube and electrically charged plates to realize that atoms have a negative charge. Called the small negatively charged particles in the atom corpuscles (electrons). Made the plum pudding model as a theory as to the arrangement of the electrons.

British physicist (born in New Zealand) who discovered the atomic nucleus and proposed a nuclear model of the atom (1871-1937)

English chemist and physicist who formulated atomic theory and the law of partial pressures

Danish physicist who studied atomic structure and radiations

Hydrogen

helium

lithium

beryllium

Boron

carbon

nitrogen

oxygen

fluorine

neon

sodium

magnesium

aluminum

silicon

Phosphorus

sulfur

Chlorine

argon

potasium

calcium

scandium

titanium

vanadium

chromium

manganese

iron

Cobalt

Nickel

copper

Zinc

krypton

silver

Gold

xenon

tin

iodine

mercury

lead

radon