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Question

Define the following
1)atom
2)atomic number
3)valency


Solution

Atom: the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction; the number of protons determines the identity of the element.

Atomic number:the number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally .

valency: The capability of an atom to gain or lose it valence electrons in order to complete it's valence shell ( last shell) is known as valency 
.                     Or 
the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with.

Above given both definition are correct  u can write whichever one u want...Hope u do well in exams  cheers!!
 

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