Catalyst1. What are the three subatomic particles and

where is each one located?2. What does neutral mean and how do we

keep atoms neutral?

End

Rate Yourself

• Based on the exit ticket and your current level of understanding, rate yourself 1 – 4 on LT 1.1

Lecture 1.2 – Introduction to the Periodic Table

Today’s Learning Target

• 1.2 – I can create a Periodic Table and explain how atomic number, atomic mass, and periodic trends are illustrated on this table.

The Periodic Table

• On the Periodic Table, we are told the following about every element:– Atomic Number– Atomic Mass– Element Name– Element Symbol

Atomic Number

• Atomic Number – The number of protons in the nucleus of an atom.

• Atomic number is the same for all atoms of the same element.

Atomic Number

Atomic Mass

• Atomic Mass – The mass of an atom

• Atomic Mass = # Protons + # Neutrons

Atomic Mass

Element Name and Symbol

• Every element has a 1 or 2 letter symbol.

• The first letter is ALWAYS capitalized.

Lab 4 – Constructing a Periodic Table

Periodic Table Arranged By Atomic Number

• The Periodic Table is arranged by increasing atomic number since this is what makes an element unique from another element.

• Two elements can have the same atomic mass, but two elements can never have the same atomic number

SUMMARIZE

Closing Time• Practice 1.2 – Periodic Table