The modern periodic table classifies elements according to this
Atomic Number
100
Vertical columns of elements in the periodic table are called this
Groups (families)
100
Production of bubbles with a color change
Chemical Change
100
The boiling point of Ar is -186 degrees C and Xe is -112 degrees C. Estimate the boiling point of Krypton.
-186 + - 112 = -298/2 = -149 degrees C
100
How many elements are there on the periodic table?
109 Elements
88 = Natural in nature
21 = man-made or artificial
200
Name 3 of the 7 metalloids.
B, Si, Ge, As, Sb, Te, Po
200
Magnesium has 12 protons, how many electrons does it have?
12 electrons (#protons = #electrons)
200
Name two properties of nonmetals.
brittle and nonconductive
200
The melting point of K is 337 Kelvin (K) and Cs is 302 K. Estimate the melting point of Rb.
337 + 302 = 639/2 = 319.5 K
200
Who invented the periodic table?
Mendeleev
300
Where are the most active metals found?
far left side - Alkaline Metals
300
Which is the most reactive family of the nonmetallic elements?
Halogen Family
300
Properties such as density, melting point, or boiling point are considered to be what type?
Physical Properties
300
Fill in the blank:
Metals ten to ___________ their outermost electrons and nonmetals tend to _________ electrons.
lose, gain
300
Noble gases have 3 similar properties, name them.
1. odorless
2. colorless
3. unreactive
400
Which family lose their outer electrons easily
Alkalimetals
400
How many neutrons does Zinc have?
Atomic mass = 65, Atomic number = 30
65 - 30 = 35 neutrons
400
What type of change is each of the following:
1. Rubbing Alcohol evaporates
2. The flashbulb on a camera flashes
3. Tomato juice is made from ripe tomatoes
4. A salt tablet is dissolved in 8 cups of water
1. Physical
2. Chemical
3. Physical
4. Physical
400
If the formula for Potassium oxide is K2O, what is the correct formula for a compound containing rubidium and selenium?
Rb2Se
400
Is corrosion a physical or chemical property? Why?
Chemical - change in color
500
The melting points of the metals in the lithium family decrease going down the family. Why is this?
the attractions between atoms of the metal decrease.
500
Fill in the blank:
The size of atoms ______________ as we go down the periodic table, and _________________ as we move across the periodic table (left to right)
increase, decrease
500
Name 5 indications that a chemical change (reaction) has taken place.
1. Formation of precipitate
2. Evolution of gas
3. Color change
4. Temperature change
5. Production of light
500
Na2O MgO Al2O3 SiO2 N2O5 NaCl MgCl2
Using the information, predict the formulas for the compound that would form: P and Se, Li and F, & Be and S
You will have 2 minutes...
1. P2Se5
2. LiF
3. BeS
500
Metals = Cu Mg Zn Ag
Melting Points = 1083 651 419 961
2 Part Question:
1. Which will have the greatest attraction between atoms?
2. Which will have the Least attraction between atoms?