The Atom1. Parts of the atom

2. How to draw an atom

Parts of the atom

1. Proton

2. Neutron

3. Electron

Parts of the atom

Part Location Charge Mass How to find the number of:

Proton In the nucleus

Positive

(+)

1 AMUSame as the

atomic number

Neutron In the nucleus

Neutral(No charge)

1 AMUAtomic Mass

minus the atomic number

Electron Orbits the nucleus

Negative

(-)

1/1800

AMU

Usually the same as the atomic

number

Parts of the atom

Part Location Charge Mass How to find the number of:

Proton In the nucleus

Positive

(+)

1 AMUSame as the

atomic number

Neutron In the nucleus

Neutral(No charge)

1 AMUAtomic Mass

minus the atomic number

Electron Orbits the nucleus

Negative

(-)

1/1800

AMU

Usually the same as the atomic

number

The Periodic Table of Elements

The Periodic Table of Elements

The Periodic Table of Elements

Rules for Elements’ Symbols

• First letter is always capitalized

Rules for Elements’ Symbols

• First letter is always capitalized

• Second and third letters, if any, are always lower case

Helium

Proton Same as the atomic number

NeutronAtomic Mass minus the

atomic number

ElectronUsually the same as the

atomic number

Proton Same as the atomic number

NeutronAtomic Mass minus the

atomic number

ElectronUsually the same as the

atomic number

p+: ? n: ? e-: ?

Proton Same as the atomic number

NeutronAtomic Mass minus the

atomic number

ElectronUsually the same as the

atomic number

p+: 2 n: ? e-: ?

Proton Same as the atomic number

NeutronAtomic Mass minus the

atomic number

ElectronUsually the same as the

atomic number

p+: 2 n: 4 - 2 e-: ?

Proton Same as the atomic number

NeutronAtomic Mass minus the

atomic number

ElectronUsually the same as the

atomic number

p+: 2 n: 2 e-: ?

Proton Same as the atomic number

NeutronAtomic Mass minus the

atomic number

ElectronUsually the same as the

atomic number

p+: 2 n: 2 e-: 2

Drawing the Helium Atomp+: 2

n: 2

e-: 2

Drawing the Helium Atomp+: 2 in the nucleus

n: 2

e-: 2

Drawing the Helium Atomp+: 2 in the nucleus

n: 2 in the nucleus

e-: 2

Drawing the Helium Atomp+: 2 in the nucleus

n: 2 in the nucleus

e-: 2 orbits the nucleus

Drawing the Helium Atomp+: 2 in the nucleus

n: 2 in the nucleus

e-: 2 orbits the nucleus

p+

p+

Drawing the Helium Atomp+: 2 in the nucleus

n: 2 in the nucleus

e-: 2 orbits the nucleus

p+

p+

n

n

Drawing the Helium Atomp+: 2 in the nucleus

n: 2 in the nucleus

e-: 2 orbits the nucleus

p+

p+

n

n

e-

e-

Drawing the Helium Atomp+: 2 in the nucleus

n: 2 in the nucleus

e-: 2 orbits the nucleus

p+

p+

n

n

e-

e-

NICE!

Now Draw:

• A hydrogen atom:

Now Draw:

• A hydrogen atom:

Now Draw:

• A hydrogen atom:

p+ :

n :

e- :

Now Draw:

• A hydrogen atom:

p+ : 1

n :

e- :

Now Draw:

• A hydrogen atom:

p+ : 1

n : 1 - 1

e- :

Now Draw:

• A hydrogen atom:

p+ : 1

n : 0

e- :

Now Draw:

• A hydrogen atom:

p+ : 1

n : 0

e- : 1

p+ : 1

n : 0

e- : 1

p+ : 1

n : 0

e- : 1p+

p+ : 1

n : 0

e- : 1p+

p+ : 1

n : 0

e- : 1p+

e-

p+

e-

Yeah Baby

!

Now try:

Lithium

Beryllium