REVIEW QUESTIONS

Chapter 4

  1. Complete each question below with an appropriate term:
    a) Un-reactive elements in the last group of the periodic table.
    b) A pure substance of two or more atoms with a fixed ratio.
    c) Elements between the main group elements.
    d) Elements in group 2 of the periodic table.
    e) Another name for homogeneous mixtures.
  2. Name and write symbol for each element described below:
    a) Alkali metal in period 4:
    b) Halogen in period 2:
    c) Alkaline-earth metal in period 3:
    d) Metalloid in period 3:
    e) Noble gas in period 5:
  3. Identify each of the following as element, compound, homogeneous mixture or heterogeneous mixture:
    a) tap water
    b) Sand on the beach
    c) Aluminum foil
    d) Pizza
    e) Baking Soda
  4. For each element below, use the information given to determine the number of protons, neutrons and electrons in its atom, and write shorthand notation for each.
    a) Krpton (Kr) atomic number ( ); mass number ( )
Notation:
b) Barium (Ba) atomic number ( ); mass number ( )

Notation:
5. Complete the missing information in the table below:
Symbol Ga
Protons 15
Neutrons 39
Electrons
Mass number 31
  1. An unknown element Q has the following isotopic data:
Isotope Mass (amu) Abundance (%)
1 80.0 60.0
2 84.0 30.0
3 82.0 10.0
Calculate the average atomic mass of this element.
7. Complete each statement below with a suitable word or phrase:
A) The "soccer ball" model of the atom is associate with a scientist named
B) Thomson discovered the in 1897.
C) Rutherford discovered that the atom was mostly hollow through the
experiment.
D) The number of protons in an atom is called the
E) Isotopes of an atom have the same but different

8. Write an abbreviated electron configuration for lead (Pb) and answer the following questions:
a) How many electrons in this atom have ?
b) How many electrons in this atom occupy f sublevel?
c) How many electrons in this atom occupy p sublevels?
9. Name the element that corresponds to each of the following:
a)
b)
c)