Atomic Structure. Mr Tan Kok Kim. Recap: Periodic Table. Elements in the periodic table - arranged in rows on the basis of increasing atomic mass. What are the vertical columns in the periodic table called? Ans: Groups. Recap: Periodic Table.
Mr Tan Kok Kim
A grey metal
melting point of about 800 degrees celsius.
Density 5.5 g/cm3
Relative atomic mass = 73.4
Properties of germanium which was discovered in 1886
A grey-white metal
melting point of about 958 degrees celsius.
Density 5.47 g/cm3
Relative atomic mass = 72.6An educated guess