For METALS, reactivity __________ as you go down a group. For NONMETALS, reactivity ________ as you go down a group.
Increases, decreases
100
What did Mendeleev organize the periodic table by?
Increasing atomic mass
100
What period is Germanium in?
Period 4
100
A huge animal shelter is full of one mole of puppies. How many puppies does the animal shelter have?
6.02 x 10^(23) puppies
100
List two elements that will form an ion with a charge of +3.
B, Al, Ga, In, Tl, Nh
200
Describe ionization energy in your own words.
The amount of energy it takes to remove the highest energy electron from an atom.
200
Who was the first scientist to group elements in a certain way? In what way did he group them?
Dobereiner. He grouped them in triads, groups of 3 elements with similar properties.
200
What is the number AND name of the group Radium is located in?
Alkaline Earth Metals (Group 2)
200
I have 0.97 moles of Aluminum. How many grams of aluminum do I have?
26.17 grams
200
Woo! Everyone on your team gets a piece of candy!
:D
300
Effective nuclear charge _________ as you go _______ a group, because _________________.
decreases, down, you are increasing the number of core electrons shielding some of the positive charge from the nucleus
300
Name at least one specific thing that was wrong with Mendeleev's periodic table.
Hydrogen didn't have a specific spot, noble gases were missing, some elements were out of order (not low to high mass), some elements did not have similar properties to other elements in their group.
300
Give me THREE specific properties of Alkali Metals.
Very reactive, vigorously react with water, conductive, malleable, ductile, make basic solutions when dissolved, have one valence electron, soft, low densities, low melting points, etc.
300
How many atoms of Carbon do you have, if you have 4.5 moles of Carbon?
2.71 x 10^(24) atoms
300
I am an element with 1 valence electron, and I am less reactive than the element in my group that is in the 3rd period. What element am I?
Lithium
400
Which element has the largest atomic radius? WHY does it have a large atomic radius than Rubidium?
Francium. Because of the increase in core electrons causing a decrease in effective nuclear charge.
400
Woo! Free piece of candy for everyone in your team!
:D
400
What is the least reactive family on the periodic table? WHY are they the least reactive?
Noble Gases. They have a full octet, a valence shell with 8 electrons. They do not want to gain or lose electrons, so they have very low reactivities.
400
Ms. Kossa measures out 13.56 grams of Magnesium. How many moles of Magnesium does she have?
0.558 moles of Magnesium
400
If I have 1.469 x 10^(24) atoms of Chlorine, how many moles of Chlorine do I have?
2.44 moles
500
As you go left to right on the periodic table, you add electrons. So, why does atomic radius get smaller??
As you go left to right, you also add protons. More protons means a higher effective nuclear charge, pulling the electrons in more tightly, resulting in a smaller atomic radius. The electrons that are added are in the valence shell, they aren't core electrons, so they don't decrease the effective nuclear charge.
500
State the modern periodic law, and name the scientist who made the final alteration to Mendeleev's law to create this modern law.
Chemical and physical properties are a periodic function of elements when ordered by increasing atomic mass. Moseley.
500
Dr. Kossa creates an unknown element in her lab, which she calls ZX. When she tests it, she find that ZX is a gas. When cooled to form a solid, it is brittle, and does not conduct electric current very well. It seems to have a high reactivity. Which group does ZX fit in best?
Halogens
500
Ms. Fields measures out 500.25 grams of Strontium. She wants to know how many atoms of Strontium she has. Can you help her? How many does she have?
3.44 x 10^(24) atoms
500
Ms. Hlavinka is making a computer chip and needs exactly 300 grams of Silicon. How many atoms of Silicon does she need, exactly?