Please answer asap! question: Use the periodic table to write the electron configuration of selenium (Se).

1s2 2s2 2p6 3s2 3p6 4 s2 3 d10 4 p4

Explanation:

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i do not get it   at all

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.