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Activity: Practicing
Atomic Structure 2

Atomic Symbol Mo with A and Z positions indicated atomic symbol of molybdenum (Mo) showing the atomic number and mass number of molybdenum-96
molybdenum-96

Z = 42 & A = 96
Z = the number of protons
Z = the atomic number

A = the atomic mass
A = the atomic mass number
Z + n0 = A or
A - Z = n0
Reading the periodic table:
An example of how to read the periodic table.

Fill in the table showing Z and A in the symbol, like in the example of molybdenum given above. Since these atoms are neutral they have the same number of electrons as protons. So the overall charge for all of them is 0.

For these problems you need to know how to read the names of isotopes.
In aluminum-27 the word gives you the name of the element. The number gives you the mass of the isotope. Find the element on the periodic table. The atomic number (see key above) tells you how many protons that element has. The mass tells you the sum of protons plus neutrons for that isotope.

Name Symbol Z
No. of p+		 A - Z
No. of n0		 A
Mass		 No. of e– Overall
Charge
nitrogen-15 157N 7 8 15 7 0
  ___92 ___     235   0
        39 18 0
nickel-64           0
        59 28 0
      28 56   0
      22 41   0
  82___Kr         0
  100___Mo         0
tin-120           0
  ___50 ___   65     0
  ___19 ___     39   0
  14______ 7       0


  1. The table above has atoms which are isotopes of one another. List these here using the isotopic symbols.


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You will color your Periodic Table according to a color scheme shown by your teacher. The periodic table is divided up into groups and periods. The groups are columns and are numbered from 1 to 18. The power of the periodic table comes from the fact that elements in each group all have similar properties. Take the Noble Gases, group 18. All of these elements share the common trait that they have practically no chemical reactivity at all. That means that they do not combine with other atoms to form compounds. The periods are the rows of the periodic table. The rows below the main table that start with lanthanum ( La) and actinium (Ac) belong to periods six and seven.

The color scheme you will use is a bit complicated. This is because the block on the right side consists of metals, semi-metals, and non-metals. Metals are shiny, conduct electricity and heat well, and are easily bent and shaped. Non-metals are dull-colored, do not conduct electricity or heat, and are brittle (or are gases). Semi-metals have traits of both metals and non-metals.

Questions

Use your notes and the information on this worksheet to answer the following questions. Answer using complete sentences.

  1. Define atom.
  2. Define element.
  3. Define isotope.
  4. Define period. How many are there?
  5. Define group. How many are there?
  6. Define atomic mass. Give the average atomic mass of Os, Ni, P, O, Al and N.
  1. Define atomic number. Give the atomic number of K, Na, F, Cl, Pb, and Au.
  2. List all of the elements by name and symbol for period 2.
  3. List all of the elements by name and symbol for group 14.

  1. Where are non-metals on the periodic table? Give five examples of non-metals.
  2. Where are transition metals on the periodic table? Give five examples of transition metals.
  3. Where are halogens on the periodic table? Give three examples of halogens.
  4. Where are the noble gases on the periodic table? Give four examples.
  5. Where are the alkali metals on the periodic table? Give four examples.
  6. What important number determines the order of the elements in the periodic table? What does this number mean?
  7. If you only know the mass of an element, how can you find it on the periodic table? What elements have the following masses: 192.22 amu, 238.03 amu, 55.845 amu, 32.065 amu, and 12.011 amu?
Students will need a periodic table to complete this exercise.
Last updated: Nov 30, 2006        Keller Home  |