Give the total number of electrons, the number of valence electrons, and the identity of the element with each electronic confi guration. a. 1 s22 s22 p63 s23 p6 b. 1 s22 s22 p63 s23 p64 s23 d7 c. 1 s22 s22 p3 d. [Kr]5 s24 d105 p2

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.