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# Drawing a Bohr Diagram

Parts of an Atom & Bohr Diagrams
by

## Camille Whiteside

on 25 September 2013

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#### Transcript of Drawing a Bohr Diagram

Drawing a Bohr Diagram
review
parts of an atom
proton
neutron
electron
in nucleus
mass = 1 a.m.u.
charge = positive
p or +
in nucleus
mass = 1 a.m.u.
charge = 0
n or 0
electron cloud
mass = almost 0
charge = negative
e or -
Bohr Diagrams
Atomic # = # of protons
Atomic mass round to the nearest whole #
Atomic mass = # of protons + # of neutrons, so
# of n = atomic mass - atomic number
# of e = # of p = atomic # (only in neutral atom
formulas
rules
protons & neutrons make up the nucleus
In our class, protons are green
In our class, neutrons are blue
In our class, electrons are red
general
electrons
electrons go into shells
1st shell holds two electrons
if there are more than two electrons, go to next shell
2nd holds 8 electrons
if more than ten electrons, move to 3rd shell
examples
What do
these
numbers
mean?
Atomic # of 6 means 6 protons
Atomic mass rounds to 12
Atomic Mass - Atomic # = # of Neutrons
12 - 6 = 6 neutrons
In a neutral atom, the # of electrons = # of protons
6 protons in a neutral atom of carbon 6 electrons
6 protons
6 neutrons
6 electrons
It can also be drawn like this...
9 protons
10 neutrons
9 electrons
or like this...
How many protons?
How many neutrons?
How many electrons?
How many protons?
How many neutrons?
How many electrons?
11 protons
12 neutrons
11 electrons
Sulfer (S) has:
16 protons
16 neutrons
16 electrons
Aluminum (Al) has:
13 protons
14 neutrons
13 electrons
Chlorine (Cl) has:
17 protons
18 neutrons
17 electrons
Full transcript