Selenium, an element required nutritionally in trace quantities,forms compounds analogous to sulfur. Name the followingions: (a) SeO42-, (b) Se2-, (c) HSe-, (d) HSeO3-.

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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.