what is valency and mass
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mass: it is a type of weight
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Valency :-
the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with
Mass :-
Mass, in physics, quantitative measure of inertia, a fundamental property of all matter. It is, in effect, the resistance that a body of matter offers to a change in its speed or position upon the application of a force. The greater the mass of a body, the smaller the change produced by an applied force.
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