The electron configuration of an element is shown below.
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1 4d10
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The periodic table and its elements are arranged in an order.
State what factor determines the order of elements in the periodic table.
The periodic table is divided into blocks. State why bromine, phosphorus, and nitrogen are all classified as p-block elements.
State the meaning of the term ‘periodicity’.
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