Chemistry Unit 1

Democritius

He believed everything was made up of tiny particles called atoms.

John Dalton

He “discovered” the atom. Billard Ball Model

J.J. Thompson

Discovered electrons. Plum Pudding Model

Niels Bohr

Discovered different energy levels. Bohr Model

Erwin Schrodinger

Discovered global geometry of electrons around a nucleus. Electron Cloud Model

Who discovered the neutron? What did this lead to

James Chadwick discovered the neutron and this helped better understand Isotopes.

How was the electron discovered?

A glass tube embedded in both ends.(Cathode Ray Tube)

Difference between Bohr’s Model and the most current atomic model

Electrons don’t move in fixed orbits(They are in the cloud)

What was discovered from Rutherford’s gold foil experiment?

A atom has a nucleus and the rest of the atom has empty space.

Protons are……..

Positive

Electrons are……..

Negative

Neutrons are……

Neutral

What subatomic particles are added together to equal mass of an atom?

Neutrons+Protons

If an atom is neutral, the # of electrons equals the number of which other subatomic particles.

Protons

Which subatomic particles determines the identity of an element.

Protons

C12, C13, and C14 are all…

Idotopes

The #s 12, 13, and 14 represent the …. of the isotope

Mass

Is the average atomic mass for Carbon is 12.011, the most abundant isotope is…

C12

0.020319 to 3 sig figs

0.0203

0.020319 to 2 sig figs

0.020

0.020319 to 1 sig fig

0.02