what is difference between valency and valence electron?

Ans: The combining capacity of an atom is called its valency. Actually it can be defined as the number of electrons that an atom may lose (or) gain during a chemical reaction (or) the number of electrons shared. Ex: In water molecule Hâ??O (H - O â?? H) Valency of Hydrogen is â?? 1 â?? (as it combines with Oxygen atom by one single bond) and valence electrons in Hydrogen = 1 Valency of Oxygen is â??2â?? (as it combines with two Hydrogen atoms by two bonds), but valence electrons in oxygen = 6 The numbers of electrons in outermost shell (or) valency shell of an atom are called valency electrons. Based on valency electrons the group number of an atom can be found. Ex: Number of valence electrons in chlorine are 7 so it belongs to VIIA - group, but its valency is 1. So, it is to be understood that some times valency is equal to valence electrons, but not all the time. read less

valency = combining capacity of an atom expressed as the no. of single bondsthe atom can form or the no. of electrons an element gives up or accepts when reacting to form a compound. valence electrons = electrons in the outermost atomic orbitals of an atom that can take part in forming bonds with other atoms to form molecule read less

The combining capacity of an atom is called its valency whereas number of electron present in the very outermost orbit is valence elctron.valancy, Actually it can be defined as the number of electrons that an atom may lose (or) gain during a chemical reaction (or) the number of electrons shared. it is to be understood that some times valency is equal to valence electrons, but not all the time. EX:-(NACl:- Both have combining capacity of 1,(NA--CL) So valanecy is 1 for both but valance electron for both have different like sodium has 1 and chlorine has 7) read less

What are valence electrons ? It is the no. of electrons in the outermost shell of an atom. Valence electrons are electrons that can participate in chemical bonds with other atoms. For main group elements, the number of valence electrons is easy to determine: it equals the element's group number (a Roman numeral you'll find at the top of the column the element is in, on the periodic table). For main group elements, the number of valence electrons follows naturally from the atom's electronic configuration. In all of these elements, the s and p electrons are valence electrons. In the transition metals, it is possible to have some of the d electrons participate in bonding in addition to the outer s electrons. It isn't easy to tell by how many d electrons act this way just by looking at the transition metal atom's electronic configuration. That makes it risky to try to draw Lewis structures for transition metal compounds. What is the Valency of an Element? Valency is the number of hydrogen atoms that can combine with [or displace] one atom of the element [or radical] to form a compound. For example, two atoms of hydrogen combine with one atom of oxygen to form water [H2O]; so, the valency of oxygen is two. Similarly, the valency of chlorine in the compound hydrogen chloride [HCl] is 1, and the valency of the ammonium radical [NH4] in the compound ammonium chloride [NH4Cl] is 1. For elements that do not combine with hydrogen, the valency is the combining power of the element with another element whose valency is known. Valency may also be defined as the number of electrons that an atom donates or accepts to form the duplet state (i.e., 2 electrons in outermost shell) or octet state (i.e., 8 electrons in outermost shell). The valency of an element is always a whole number. Elements with valency one are monovalent, those with valency two are divalent, and those with valency three are trivalent. All metals, hydrogen and the ammonium radical have positive valencies ' read less

valency = combining capacity of an atom expressed as the no. of single bonds the atom can form or the no. of electrons an element gives up or accepts when reacting to form a compound. valence electrons = electrons in the outermost atomic orbitals of an atom that can take part in forming bonds with other atoms to form molecule read less

valency can be referred as the combining capacity of an atom to form a molecule or when it is forming a chemical compound.The valence of hydrogen atom is 1. In methane, carbon has a valence of 4; in ammonia, nitrogen has a valence of 3; in water, oxygen has a valence of two.Valence diagrams of a compound represent the connectivity of the elements, with lines drawn between two elements, sometimes called bonds, representing a saturated valency for each element. Valence electrons is the no:of electrons available at the valence shell so that it can use these atoms to combine with other molecules to form a compound or with same atom to form a molecule. read less