ATOMS THE LITTLE GIANTS OF ALL MATTER!!

Matter: all matter is made up ofatoms. is anything that has a

mass and a volume all matter has a specific

density or arrangementof atoms that can be used

to identify it.

John Dalton (aka Jack)

1. Atoms are the smallest form of matter

2. Atoms make up all matter

3. Atoms of the same element are the same

4. Atoms cannot be broken down

5. Atoms combine in specific ratios

Thomson:

Discovered the electron

First model of atom

Rutherford:

Discovered presence of nucleusAnd protons

Atom was mostly empty space

Chadwick:

Discovers the neutron

Bohr:

Suggested electrons move in energy Levels

Presents model used today(although not completely accurate)

nucleus

M shell L shell

K shell

+

n

Electron cloud model

Electron cloud

Nucleus

Neutron

Proton

PERIODIC TABLE

Elements: roughly 88 naturally occurring roughly 20 man made organized arrangement metals, nonmetals, metalloids,

noble gasses pure substance

Element – pureCompound – 2 or more elements chemically combined

homogeneousMixture – 2 or more elements, compounds, or both physically combined.

homogenous or heterogeneous

Proton: positively chargednucleus

Neutron: no charge-neutralnucleus

Electron: negatively chargedenergy shells

nucleus

M shell L shell

K shell

+

n

ATOMIC MASS: no. protons + neutron

-- ATOMIC NUMBER: no. protons_________________________________

no. neutrons

LiAt. Mass 7 -- At. # 3___________________________

4Protons: 3Neutrons: 4Electrons: 3* *all unbonded atoms are electrically and chemically neutral. # of + = # of e.

Isotopes: Atoms of the same element thatDiffer from each other by the number of Neutrons. Isotopes have the same Atomic number butA different Atomic Mass.

45 known isotopes of iodineI 127, 53 I 136, 53

15 known isotopes of carbonC 12, 6 C 14, 6