Warm Up, November 20th, 2013
1) Which element is this? What does the 6 stand
for? What might the Atomic Mass measure?
2) So far, you’ve seen
random pictures of
atoms. What are some
differences between a
Hydrogen atom and a Helium atom?
Homework Check – Bill Nye Atoms
Element*
A pure substance consisting of one
type of atom.
Group*
A vertical column in the Periodic Table.
Period*
A horizontal row in the Periodic Table.
So what is an element?
Well, this is Carbon.
So what is an element?
Here’s Gold!
So what is an element?
And Helium!
So what is an element?
What about Hydrogen?
So what is an element?
Hydrogen’s atomic structure
Hydrogen:
1 Proton
1 Electron
0 Neutrons
So what is an element?
Helium’s atomic structure
Helium:
2 Protons
2 Electrons
2 Neutrons
Hydrogen
Helium
Atomic Number*
The number of protons in an element.
Atomic Mass*
The number of protons and neutrons in
an element.
Chemical Symbol*
The uppercase (and sometimes lowercase)
letters that represent an element.