Key Concepts in Chemistry

Write the formula for copper nitrate

A normal sample of chlorine contains only chlorine-35 and chlorine-37 atoms.

Explain why the relative atomic mass of chlorine is 35.5

• Relative atomic mass measures the average mass of isotopes present

• There is a higher abundance of Cl-35 than Cl-37

Compare a use of diamond with a use of graphite, explaining each use in terms of the bonding and structure. In your answer you should use information from the diagrams.

Explain what is meant by the term relative atomic mass.

• The average mass of an elements atoms

  • Compared to 1/12 of the mass of a C-12 atom

Mendeleev was a Russian chemist who produced the first version of the periodic table.

Give one similarity and one difference between his version of the periodic table and the periodic table shown on page 2.

• Both periodic tables put elements with similar properties in the same group

• However Mendeleev’s table had gaps