Chemistry in Biology

Atomic Mass

Number of neutrons plus protons in an atom, weight of an atom

Atomic Number

Number of Protons in an atoms

Neutron Calculation

Atomic mass - atomic number/protons

Number of Electrons

Atomic number

Octet Rule

8 electrons in valence shell

Isotope

Elements with same atomic mass but different atomic number

Non-Polar Covalent Bond

Bond where electrons are shared because of the same electronegativity (difference less then 0.5).

Polar Covalent Bond

Bond where partial charges are created because of intermediate difference in electronegativity (difference between .5 and 1.7/2)

Ionic Bond

Bond where electrons are taken from an atom and given to another (electronegativity difference is greater than 1.7/2)

1st Element

Hydrogen

2nd Element

Helium

3rd Element

Lithium

4th Element

Beryllium

5th Element

Boron

6th Element

Carbon

7th Element

Nitrogen

8th Element

Oxygen

9th Element

Fluorine

10th Element

Neon

11th Element

Sodium

12th Element

Magnesium

13th

Aluminum

14th Element

Silicon

15th Element

Phosphorus

16th Element

Sulfur

17th Element

Chlorine

18th Element

Argon