REVIEW QUESTIONS

Chapter 4

1. Complete each question below with an appropriate term:
   a) Noble gases Un-reactive elements in the last group of the periodic table.
   b) Compound A pure substance of two or more atoms with a fixed ratio.
   c) Transition metals Elements between the main group elements.
   d) Alkaline-earth metals
   Alkaline-earth metals Elements in group 2 of the periodic table.
   e) Solutions Another name for homogeneous mixtures.
2. Name and write symbol for each element described below:
   a) Alkali metal in period 4: K, potassium
   b) Halogen in period 2: F, fluoring
   c) Alkaline-earth metal in period 3: Na, sodium
   d) Metalloid in period 3: Si, silicon
   e) Noble gas in period 5: Xe, xenon
3. Identify each of the following as element, compound, homogeneous mixture or heterogeneous mixture:
   a) tap water homogeneous mixture
   b) Sand on the beach heterogeneous mixture
   c) Aluminum foil element
   d) Pizza heterogeneous mixture
   e) Baking Soda compound
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 (Z=36); mass number (A=84)

5. Complete the missing information in the table below:

6. An unknown element Q has the following isotopic data:

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
   John Dalton .
   B) Thomson discovered the electron in 1897.
   C) Rutherford discovered that the atom was mostly hollow through the gold-foil experiment.
   D) The number of protons in an atom is called the atomic number
   E) Isotopes of an atom have the same # of protons (atomic number) but different # of neturons (mass number) .
8. Write an abbreviated electron configuration for lead (Pb) and answer the following questions: