definw atomic size atomic mass n valency
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Explanation:
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Answer:
Explanation:
Atomic size;
Atomic size is the distance between a nucleus of an atom and it's valence or outermost shell .
Atomic size is a very important characteristic of an atom to understand the reactivity .
On this property all other properties can be figure out .
Atomic mass;
atomic mass unit is a unit which is used to express the masses of atoms, molecules, ions, etc. Its symbol is u.
1 unified atomic mass unit (u) is defined as the one-twelfth of the mass of one atom of carbon 12.
Valency;
Valency is the combining capacity of an Element. It is the number of electrons an atom of an element can gain,lose or share.
The valency of an atom is equal to the valence electrons, if it is 4 or less.
If it is more than 4, the valency is equal to 8 minus the number of electrons in the outer shell.
Example: Magnesium has electronic configuration 2,8,2. Its valence shell has 2 electrons. As 2 is lesser than 4, the valency of Magnesium is 2