1_WS01_Atoms_Molecules_and_Ions_Chapter_1_Zumdahl_Chemistry-Atoms_First.docx

Worksheet 01: Atoms, Molecules and Ions (Chapter 1; Zumdahl. Chemistry Atoms First)
Topics covered in this worksheet: atomic structure basics, symbolism, isotopes, the periodic table, naming of compounds,
the concept of mole, atomic and molecular mass.
Symbol to represent isotope;
Where, A = Mass number = # Protons + # Neutrons and Z = Atomic Number = # Protons
1. Using the Periodic Table, fill in the missing information in the chart, below.
Symbol atomic mass protons neutrons electrons charge
W 184 74 110 72 2+
35 45 0
197 118 78
128 52 54
2. For each of the numbered species that is a neutral atom, represent its composition in the form
Which of these species are isotopes? Explain why?
#1 #2 #3 #4 #5 #6 #7
protons 16 20 19 18 20 22 20
neutrons 18 20 21 22 24 26 28
electrons 18 20 18 17 18 22 20
X
A
Z
X
A
Z

3. For the following elements, identify the group and period number for each of the following elements, and classify the
element as a metal or non-metal.
Element Group # Period # Metal/Non-mental
1 Ga
2 P
3 I
4 Ra
5 Li
6 La
7 Xe
4. Fill the following table
Element