Chemistry 4-6

atom

the smallest particle of an element that retains all the properties of that element; is electrically neutral, spherically shaped, composed of electrons, protons, neutrons

atomic mass

the weighted average mass of the isotopes of that element

atomic mass unit

One- twelfth the mass of carbon 12 atom

atomic number

the number of protons in an atom

electrons

A negatively charged, fast moving particle with an extremely small mass that is found in all forms of matter and moves through the empty space surrounding an atom's nucleus

isotope

Atoms of the same element with different numbers of neutrons

mass number

the number after an elements name, representing the sum of its protons and neutrons

neutrons

A neutral subatomic particle in an atom's nucleus that has a mass nearly equal to that of a proton

nucleus

the extremely small, positively charged dense center of an atom that contains positively charged protons and neutral neutrons

proton

a subatomic particle in an atom's nucleus that has a positive charge of 1+

Daltons

did not account for the existence of subatomic particles

What's wrong with Dalton's model

JJ Thompson Plum Pudding Model

the atom is mostly empty space

Whats wrong with the plum pudding model

Rutherford

the negative electron will collapse into the positive proton

what was wrong with Rutherford's model

Bohr's

the toms move too fast to be given a rigid location

what was wrong with Bohr's model

quantum mechanical model

still more to discover

What was wrong with the quantum mechanical model

S-block

p-block

d-block

f-block

metals period table

metalloids

non-metals

alkaline metals

alkali metals

halogens

noble gases

transition elements

inner transition elements