Explain the following terms a. Valency b. Mass number c. Molecule d. Valence electrons
Answers
Answer:
valency : the loss or gain of electrons is known as valency
mass number : the sum proton and neutron is called mass number
molecule : the group of atom is called molecules
valence electrons : the electrons present in outer most cell of an atom is called valence electrons
Answer:
a} The valency of an element is the number of hydrogen atoms that can combine with or replace (either directly or indirectly) one atom of the element.
b} The total number of neutrons and protons in the nucleus of a particular atom Symbol is called Mass Number
c} A molecule is an electrically neutral group of two or more atoms held together by chemical bonds.
d} A valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.