Category I
Dmitri Mendeleev
It means something repeats itself in a predictable pattern
How many elements are on our current periodic table?
118
What is the lightest element on the periodic table?
Hydrogen
What is the name of the chart with all the elements, boxes, and letters on it?
The Periodic Table (of Elements)
On our current periodic table, elements with similar properties are arranged in:
columns
Mr. Mendeleev's periodic table was arranged according to:
The Noble Gases are located where on our current periodic table
Last Column on the Right (Group 18)
How does our current periodic table arrange the elements?
by increasing atomic number
On Mendeleev's periodic table, elements with similar properties were arranged in:
rows
How many rows are on our current periodic table?
seven
If you wanted the most explosive reaction with water, which metal should you drop in it:
lithium, sodium, potassium, rubidium, cesium?
cesium
Mendeleev was famous for using his periodic table and...
predicting the existence and properties of undiscovered elements (and he was right!)
What is unique about the elements nowadays that get added to our periodic table?
They are manmade (synthesized) in labs
<they are also radioactive>
How many columns are on our current periodic table?
18
When Mendeleev arranged the elements in his periodic table, what did he notice about the arrangement of the elements?
The properties of the elements seemed to be repeating periodically
Well aren't you lucky - here's 400 free points!
:)
Do the patterns of the properties of the elements on the periodic table fit better when arranging by atomic mass or by atomic number?
atomic number
How many protons does the element oxygen have?
Oxygen has 8 protons
Why didn't Mendeleev arrange his periodic table by atomic number instead of atomic mass?
Protons had not been discovered at the time Mendeleev made his periodic table
Are there places on our periodic table where the element with a certain atomic number has a lower mass than the element before it.
Yes
Ar: Atomic #18, Atomic Mass 39.95
K: Atomic #19, Atomic Mass 39.10
What chemical makes up snow?
water - H2O
When elements are arranged by increasing atomic number, the properties of those elements repeat themselves every so often - this is called:
Periodic Law
What makes every element different from each other in the universe?
Each element has a unique number of protons
What chemical did you use, in the very first lab we did, that is being used on the roads today?
Calcium Chloride (CaCl2)