why do metals exits in combine states?
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The metals having appreciable reactivity are found in the combined state. They occur as oxides, halides, sulphides, phosphates, silicates etc. The highly electropositive elements (Na, K, Mg, etc.) This is because oxygen is very reactive and very abundant on earth.
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The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. ... Velocity is a physical vector quantity; both magnitude and direction are needed to define it.
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