C1 Flashcards
Where are the groups on the periodic table
At the top
Where are the periods on the periodic table
On the side
What is a compound
2 or more elements that are chemcially joined
What is an element
One type of atom
What is inside a nucleus of an atom
Protons and neutrons
Why can you easily separate a mixture but not a compound
Because a compound is chemically joined
Describe the basic structure of an atom 
In a nucleus, there are protons and neutrons, orbiting, the nucleus that are electrons in shells
What is the plum pudding model?
Cloud of positive charge with negatively charged electrons randomly scattered inside and protons
Who made the plum pudding model, and when
JJ Thompson, in the 1800s
How was the evidence for a nucleus found? 
That’s when firing positively charge particles at gold foil, it deflected back to its source
Why did the model of the atom change over time?
Because new discoveries were being made about what was in an atom
Who made the nuclear model of the atom
Rutherfords
What did the nuclear model consist of
A dense positively charged nucleus and electrons zooming around the nucleus (nor in shells)
What is a mixture
2 or more substances that aren’t chemically bonded
Name the masses of protons, neutrons and electrons
P, 1
N, 1
E, almost 0
