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How are the elements ordered in periodic table
By increasing atomic number, in other words by the number of protons.
What are periods
The horizontal rows, tells us the number of the highest energy electron shell for the elements in that period, e.g all elements in period 4, the highest energy electron shell is shell 4
What are metalloids
They are between metals and non metals, they have properties of both metals and non metals.

What is periodicity
The pattern of repeating trends.
What does shell 3 have
The 3d subshell, has max of 10electrons
4s subshell has lower energy than 3d subshell,
