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The Atom
Chemistry Review Sheet #1
1. What is an atom? __smallest part of an element that contains all the
properties of the
element_______________________________________
2. List the location, mass, and charge for each subatomic particle.
a. proton: inside nucleus, 1 amu, +
b. neutron: inside nucleus, 1 amu, neutral
c. electron: in energy levels around nucleus, 0.0006 amu, 3. What is the atomic number of an atom?
_____ number of protons
4. What is the mass number of an atom? _ protons plus neutrons
5. An atom has 53 protons, 74 neutrons and is found in group #17 on the
periodic table.
a.
b.
c.
d.
What is the atom’s atomic number? 53
What is the atom’s mass number? 127 amu
What element is this? Iodine
How many electrons does this atom have? 53
How do you know? Number of electrons is = to protons in
neutral atom
6. Atom A has 12 protons and 12 neutrons. Atom B has 12 protons and 13
neutrons.
These atoms are the same element because they have the same
number of protons. (atomic number)
8. Draw a Bohr model of one Sulfur(S) atom.
Chapter 6: The Periodic Table
1. The horizontal rows on the periodic table are called periods_.
2. The vertical columns on the periodic table are called groups or families.
3. The Periodic Table is arranged by increasing atomic number. __.
4. Describe the location of metals, nonmetals, and metalloids on the periodic
table. Metals on left side, nonmetals on right side, metalloids along the
zigzag line.
5. What are some physical properties of metals? Good conductors of heat
and electricity, ductile, malleable, shiny when cut.
6. What does “Malleable” mean? Can be hammered into flat sheets
a. What does “Ductile” mean? Can be pulled into a wire shape
7. What is a metalloid? Along zigzag line of table, have properties of metals
and nonmetals.
8. Elements that belong to the same group have _similar_ properties.
9. What information is in the “Periodic Square” for each element?
C is the element symbol. Carbon is the element name. 6 is the atomic number
(number of protons). 12.011 is the atomic mass (protons + neutrons)
9. Which group/family is highly reactive? Group 1
10. Which group/family doesn’t bond with other elements? Noble Gases (18)
Name________________________ Period____ Date__________
Chemistry Review Sheet #2
Compounds
1. What is a compound? 2 or more elements chemically combined
2. What is a chemical formula and what does the SUBSCRIPT indicate?
Formula shows the elements in a compound and the subscript indicates how
many atoms of each element are needed.
3. What is a chemical equation? Shows how compounds combine chemically
to form new and different substances.
4. The Law of Conservation of Mass states: Mass cannot be created or
destroyed, the number of atoms on each side of a chemical equation have to
be equal.
5. . Count the number of atoms in each of the following compounds.
a. HCl
Hydrogen = _1__ atoms Chlorine = _1__ atoms
b. NH3
c. CCl4
Nitrogen = 1
Carbon = 1
Hydrogen = 3
Chlorine = 4
7. Does the chemical equation below illustrate the Law of Conservation
of Mass? Why or why not?
Yes. The number of atoms on each side of the reaction are equal.