9) Which of the following does NOT describe a metal? A) good conductor of heat B) good conductor of electricity C) tends to gain electrons D) forms ionic compounds with nonmetals E) found on the left side of the periodic table. 10) Which of the following elements is a transition metal? A) Ce B) N C) Br D) K 11) lodine belongs to the A) alkali metal B) alkaline earth metal C) halogen D) noble gas E) Be group of the periodic table.

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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.