According to the periodic table above, phosphorus belongs to Group 5A. There is one exception to this rule and that is the valency of hydrogen is equal to the number of valence electrons, which is 1 through hydrogen is a nonmetal element. In other words, the hydrogen atom loses one electron to become stable.. Phosphorous with valency 5: In case of PCl 5, one of 3s electron gets promoted to 3d orbital as follows: P: 1s 2 2s 2 2p 6 3s 1 3p 3 3d 1. D. 1. Why two different valency? As shown in the above image of water molecule (H 2 O), each of the two hydrogen atoms (H) shares one electron with the oxygen atom.. While Chlorine atoms have received the one needed electron, Phosphorus’s valency is 3. B. Step 5: Visualizing the diagram, we come up with a Phosphorus in the center, housed by 5 Chlorine atoms. So the number one indicates the valency or the combining capacity of the Hydrogen atom in H 2 O molecule.. The Valence Electrons are found in different types of orbitals. Add your answer and earn points. These electrons can form chemical bonds. Types of Valency. The valency of phosphorus is 3 or 5. example : PCl3 and PCl5. Thus, valence electrons for #P# is 5. The valency of 5 is due to exitation of an electron from 3s orbitals to 3d orbital. Therefore, Its valence electrons should be 5. Let's check using the electron configuration: #1s^2# #2s^2# #2p^6# #3s^2# #3p^3# = 15 electrons = atomic number of #P# The outermost orbitals, #3s^2# #3p^3#, contains 5 electrons. B. C. 4. Why does phosphorus have a valence of 5? It contains empty 3d orbitals so phosphorus can expand its octet by exciting on electron from 3s to 3d. The valency of phosphorus H 3 P O 4 is: A. This could have been a problem, but it can hold the 5 Chlorine atoms, due to its empty 3d orbital. Because phosphorous has empty 3d orbitals so it can transfer one of it’s paired electrons from 3s orbital to one of the five 3d orbital. Valency: The electrons that an atom contains in its outermost shell are called valence electrons. 1 See answer ABHINAVRAJEEV006 is waiting for your help. Find the valency and valence electron in phosphorus. Correct option is . However, the reactivity of other elements depends upon their capacity to gain noble gas we know valency is the capacity of an atom to combine with a particular number of atomic number of phosphorus =15 electronic configuration of phosphorus= 2, 8. Chlorine, as it has a valence of one, can be substituted for hydrogen. Phosphorus is an element which is part of Group 15A neutral Phosphorus Atom has five valence electrons. Answer. Answer verified by Toppr . 5. Phosphorus has a valence of 5 in phosphorus pentachloride, PCl 5. The valency of a non-metal element is usually equal to eight minus the number of valence electrons in its atom. Due to the number of valence electrons, Phosphorus is capable of forming three bonds with other elements. ABHINAVRAJEEV006 ABHINAVRAJEEV006 02/05/2021 Chemistry High School Find the valency and valence electron in phosphorus. Molecular Geometry of PCl5 P h o s p h o r i c a c i d, or H 3 P O 4 , has a total of 32 valence electrons, 5 from the p h o s p h o r u s a t o m, 6 from each of the four oxygen atoms, and 3 from each of the hydrogen atom. 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. 2. 5. These are contained in the third energy level of the atom. Fluorine, chlorine, bromine, have same number of valence electrons and same valency. Similarly, Let’s understand the same thing from oxygen’s side. Hence phosphorus can show valency 3 and 5 both. Thus, phosphorous atom undergoes sp 3 d hybridisation to form five equivalent sp 3 d orbitals each containing one unpaired electron. Get the answers you need, now!