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SCIENCE FINAL EXAM
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43
Science
8th Grade
05/15/2013

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Term
area where negatively charged electrons, arranged in energy levels, travel around an atomic nucleus
Definition
electron cloud
Term
the different posistions for an electron in an atom
Definition
energy level
Term
chemical symbol for an element, surrounded by as many dots as there are electrons in its energy level
Definition
electron dot diagram
Term
force that holds two atoms together
Definition
chemical bond
Term
attraction that holds oppositely charged ions close together
Definition
ionic bond
Term
atom that is positively or negatively charged because it has gained or lost electrons
Definition
ion
Term
combination of chemical symbols and numbers that indicate which elements and how many atoms of each element are present
Definition
chemical formula
Term
N
Definition
Nitrogen
Term
Mg
Definition
Magnesium
Term
Fe
Definition
Iron
Term
B
Definition
Boron
Term
C
Definition
Carbon
Term
P
Definition
Phosphorus
Term
Ni
Definition
Nickle
Term
S
Definition
Sulfur
Term
Al
Definition
Aluminum
Term
Au
Definition
Gold
Term
Ag
Definition
Silver
Term
I
Definition
Iodine
Term
Na
Definition
Sodium
Term
Mn
Definition
Manganese
Term
C
Definition
Calcium
Term
Zn
Definition
Zinc
Term
Cl
Definition
Chlorine
Term
H
Definition
Hydrogen
Term
Pb
Definition
Lead
Term
O
Definition
Oxygen
Term
How many electrons can the following energy levels hold: first, second, third, fourth
Definition
first-2
second-8
third-18
fourth-32
Term
Which group is known as the Noble Gases?
Definition
Group 18
Term
Which group is known as the Halogen Group?
Definition
Group 17
Term
Which group is known as the Alkali Group?
Definition
Group 1
Term
Which element is the most reactive of the Halogen Group?
Definition
Fluorine
Term
How many known elements are there?
Definition
115
Term
How many of them occur naturally?
Definition
90
Term
What are the elements that are not found in nature called because they're made by scientist in a particle accelerator?
Definition
sythetic elements
Term
State the Law of Conservation of Mass. Who introduced it?
Definition
Lavoisier
Term
measure of how much solute can be dissolved in a certain amount of solvent
Definition
solubility
Term
matter with a fixed moposition whose identity can be changed by chemical process but not by ordinary pysical processes
Definition
substance
Term
type of mixture where two or more substances are evenly mixed on a molecular level but are not bonded together
Definition
homogeneous mixture
Term
substance that dissolves the solute
Definition
solvent
Term
type of mixture where the substances are not evenly mixed
Definition
heterogeneous mixture
Term
substance that dissolves and seems to disappear into another substance
Definition
solute
Term
the compound that is formed as a result of an ionic bond
Definition
ionic compound
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