Elements
Periodic Table
Electron Shells
Ions
Collision Theory
100
What element is He?
Helium
100
Where are the non-metals located on the periodic table?
The right side
100
What are valence electrons?
The electrons in the outer shell. They are the electrons used when atoms bond and react with one another.
100
What kind of charge do electrons have?
Negative
100
Name 3 signs of a chemical reaction.
Bubbles, colour change, light or sound produced, change in temperature, gas or solids formed.
200
What is the atomic number of Carbon?
6
200
What do the columns (or groups) on the periodic table represent?
The number of valence electrons (outer shell electrons).
200
What is the maximum number of electrons that there can be in the 1st, 2nd and 3rd electron shells?
2, 8, 8 - total: 18
200
What is an ion?
A positive or negatively charged atom or compound.
200
What are the products in this reaction?
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CO2 and H2O (carbon dioxide and water)
300
How many protons does a Calcium atom have?
20
300
What do the rows (periods) on the periodic table represent?
The number of electron shells (energy levels).
300
Why is Helium a noble gas even though it only has 2 valence electrons?
All noble gases have a full outer shell. Helium only has 1 shell which is full with 2 electrons.
300
What ion does magnesium (Mg) commonly make?
Mg2+
Because magnesium is in the first column of the periodic table, it needs to give away two electrons to have a full outer shell.
300
What are the three things required for a reaction to occur?
1. A collision
2. Enough energy
3. Correct orientation
400
The first synthetic or man-made element was:
a) uranium
b) radium
c) plutonium
d) technetium
d) Technetium was the first element prepared by humans, in 1924 or 1937, depending who you credit for the discovery. The element was prepared by bombarding a molybdenum sample with neutrons. The word technetium means "artificial element".
400
How many elements are liquid at room temperature?
2 - Mercury and Bromine
400
How many shells and valence electrons does Potassium (K) have?
4 shells and 1 valence electron
400
In the ionic compound Sodium chloride (NaCl), what is the charge of the sodium atom and what is the charge of the chlorine atom?
Na+ and Cl-
400
Name 3 ways to speed up a reaction.
Increase temperature, increase concentration, decrease volume, add a catalyst, higher surface area
500
Which element is the most abundant (by weight) in the human body?
a) Hydrogen
b) Oxygen
c) Carbon
d) Calcium
b) Oxygen
Although the most abundant element in the body in terms of sheer number of atoms is hydrogen, it's mostly bonded to much heavier oxygen. Oxygen accounts for about 65% of a person's body mass.
500
What are the elements in the second column/group of the periodic table called?
The Alkaline Earth Metals
500
What is wrong with this Lewis Dot Diagram? Draw the correct one.
The electrons are not paired up or aligned correctly.
500
What causes ions to bond (ionic bonding) and form ionic compounds?
The positive and negative charges are attracted to each other.
500
