Bohr-Rutherford Diagrams of the First 20 Elements
1 Hydrogen
2 Helium
3 Lithium
4
5
6
7
8
9
10
11 Sodium
12
13
14
15
16
17
18
19 Potassium
20
Instructions:
Draw the Bohr-Rutherford diagrams for the atoms of each of the first 20 elements.
Show protons (p) and neutrons (n) in the nucleus and use ‘e’ for electrons
NOTE: Across a period, with more nuclear charge (+), the diameter shrinks and going
down a group, as electron shells are added, the diameter grows. Later we will call this
a Trend in Atomic Radius and it will explain why F is more reactive than Cl and
why K is more reactive than Li
Lewis Dot Diagrams of the First 20 Elements and Common Charges
1 Hydrogen
2 Helium
3 Lithium
4
5
6
7
8
9
10
11 Sodium
12
13
14
15
16
17
18
19 Potassium
20
Instructions:
Draw the Lewis dot diagrams for the atoms of each of the first 20 elements, then
predict their most common ion (gain or lose electrons to get an octet).
eg: Calcium Ca:  [Ca2+]
NOTE: For a proper Lewis diagram of an ion, we typically show the valence (outer shell)
electrons;