LAB1

Chemistry Worksheet

1. Atomic number equals the number of Protons or Electrons Atomic mass equals the number of Protons + Neutrons

Using the periodic table, fill in the chart for each Atom (Round the atomic mass to the nearest whole number).

2. Carbon (C)
Atomic # = ____6__Atomic Mass = _ 12 _
# of Protons = ____6____# of Neutrons = ___6_____# of Electrons = ___6_____
# of Electrons in the valence shell? __4___

3. Oxygen (O)
Atomic # = ___8___Atomic Mass = ___16____
# of Protons = ____8____# of Neutrons = ____8____# of Electrons = ___8_____
# of Electrons in the valence shell? __6___

4. Sodium (Na)
Atomic # = ___11___Atomic Mass = __23__
# of Protons = ____11____# of Neutrons = ____12____# of Electrons = ____11____
# of Electrons in the valence shell? __1___

5. Chlorine (Cl)
Atomic # = ___17___Atomic Mass = ___35___
# of Protons = ___17_____# of Neutrons = ___18_____# of Electrons = ___17_____
# of Electrons in the valence shell? __7___

6. Hydrogen (H)
Atomic # = ___1___Atomic Mass = _1_
# of Protons = ___1_____# of Neutrons = ___0_____# of Electrons = ___1_____
# of Electrons in the valence shell? __1___

7. Nitrogen (N)
Atomic # = ___7___Atomic Mass = _14__
# of Protons = ___7___# of Neutrons = ___7___# of Electrons = ___7___
# of Electrons in the valence shell? __5___

8. Identify the following as synthesis, decomposition or exchange reaction
a. 2HG + O2 = 2HgO _______synthesis_______

b. Fe2+ + CuSO4 = FeSO4 + Cu2+_______exchange reaction______

c. HNO3= H++ NO3- ________decomposition________

9. Explain the basis of Ionic bonding. Give an example.

They are made up of cations and anions.

10. Explain the basis of Covalent bonding. Give an Example
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. The stable balance of attractive and repulsive forces between atoms when they share electrons is known as covalent bonding. For many molecules, the sharing of electrons allows each atom to attain the equivalent of a full outer shell, corresponding to a stable electronic configuration.