The Periodic Table of Elements

The Periodic table of elements is a way of presenting all 118 elements to show their similarities and their differences. The periodic table of elements is arranged in increasing order of number of protons.

Atomic Number

The number of protons in an atom. The elements in the periodic table are listed according to the atomic number. The number of protons is equal to the number of electrons in an atom.

6

CCarbon12.0115

Atomic Symbol

One two or three letters used to represent the atom of an element.

6

CCarbon12.0115

Atomic Mass

The weight of an atom. The atomic mass is the sum of the protons and neutrons in the nucleus.

6

CCarbon12.0115

Take the challenge on your sheet.

Chemical Bonding

Chemical Bonding – Atoms and molecules can come together to form complex molecules needed for life.

Atoms of elements share electrons and this makes them “stick” together.

Chemical Bonding

Bonds hold elements together to form compounds. Can you list examples of compounds? 

Chemical Bonding

The compound pictured below is very important to life on Earth. Do you know what it is? 

Hint: Autotrophs make this molecule and use it to preform the life process of respiration.