The pair of elements which would likely have similar valency and similar chemical behavior is BORON AND ALUMINIUM.
Both boron and aluminium have three electrons in their outermost shells. The possession of the same amount of electrons in their valence shells will make the elements to behave in the same manner chemically in term of bond formation and chemical reactions.
The type of clothes you should wear in a labratory is a lab coat and goggles to protect your eyes from harmful chemicals you may use.
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Because of its rotation, the inner core of Earth is the cause of its magnetic field. This magnetic field helps protect the surface of the Earth from cosmic rays and other space-related particles. Human life could never have developed without this protection. The heat also accounts for most of the geological activity on Earth, including continent drift, and the magma associated with volcanic activity.