Is Octasulfur a compound or element?
It is an elemental sulfur and a homomonocyclic compound. Sulfur is a chemical element that is present in all living tissues. The most commonly used form of pharmaceutical sulfur is Octasulfur (S8).
Why does phosphorus exist as p4 and not p2?
The P2 molecule of phosphorus is not found because of the larger size of the phosphorus atom. And because of catination it can join with its own atoms and make covalent bonds. and thus it makes P4 molecule.
Why is N2 more stable than P2?
For Nitrogen: six N-N bonds in a similar N4 tetrahedron gives 978 kJ/mol. Two N2 molecules would have a total bond enthalpy 945 x 2 = 1890 kJ/mol-1. So, it is much more stable to have two N2 molecules than one N4.
Does N4 exist?
N4 molecule does exist as gas at room temperature but as a metastable allotrope.
Why N2 is gas and P4 is solid?
Answer. N2 is exist as diatomic molecule in which two nitrogen atoms are attached to each other by triple bond this triple bond is due to p(pie)-p(pie) multiple bonding (sidewise overlapping) and such bonding is not possible in phosphorus due to it’s large size but possible in nitrogen due to it’s small size.
Why nitrogen does not form NCl5?
Answer. Due to absence of d-orbital in Nitrogen, it can’t form NCl5 where due to presence of d- orbital in Phosphorus, it can form PCl5.
Why nitrogen can form NCl3?
There is no vacant d-orbital in the outermost orbit of Nitrogen. Thus nitrogen show valency only three. Hence nitrogen forms only NCl3 but phosphorus forms PCl3 and PCl5 both.
Why nitrogen Cannot form Pentahalide?
Octet configuration is defined as the atom that should contain 8 electrons in the valence shell. L shell doesn’t hold d-orbitals, so Nitrogen doesn’t have vacant d-orbitals, so it cannot form expanded octet configuration. So, Nitrogen is unable to give pentahalides, Nitrogen only forms trihalides.
Which does not form Pentahalide?
Nitrogen does not form a pentahalide because of the non-availability of the d orbitals in its valence shell.
Why are Pentahalides more covalent than Trihalides?
The oxidation state of +5 in pentahalide is more as compared to +3 oxidation state in trihalides due to higher positive oxidation state of the central atom in case of pentahalide. These atoms will have larger polarizing power than the halogen atom attached to them.
Is nitrogen a pentavalent?
Nitrogen can’t be pentavalent in resonance structures because of arbitrary restrictions that say that nitrogen must always follow the octet rule, but phosphorus need not follow that rule. But nitrogen can have oxidation states up to +5, and is pentavalent in nitric acid.
What is a pentavalent?
(ˌpɛntəˈveɪlənt) adj. (Chemistry) chem having a valency of five. Also: quinquevalent.
How is pentavalent vaccine given?
The injectable EPI vaccines are each given by a specific route and site: BCG vaccine is injected intradermally into the upper right arm; measles vaccine is injected subcutaneously into the upper arm; pentavalent vaccine and pneumococcal vaccine (PCV10) are injected intramuscularly into opposite upper thigh muscles; …
Where is pentavalent vaccine given?
Hib vaccine is given by injection in the thigh, it is safely given as one injection that also contains Diphtheria, Pertussis, Tetanus(DPT) and Hepatitis B vaccines, so your child will continue to receive the same number of injections as before.
What is the use of pentavalent vaccine?
Pentavalent vaccines (a combination vaccine which protects against five killer diseases: diphtheria, pertussis, tetanus, hepatitis B and Hib) have been launched in 65 out of 67 GAVI eligible countries by 2011.
Why is BCG given at birth?
In most tuberculosis (TB) endemic countries, bacillus Calmette Guérin (BCG) is usually given around birth to prevent severe TB in infants. The neonatal immune system is immature. Our hypothesis was that delaying BCG vaccination from birth to 10 weeks of age would enhance the vaccine-induced immune response.
At what age is rotavirus vaccine given?
The first dose of rotavirus vaccine should be given before a child is 15 weeks of age. Children should receive all doses of rotavirus vaccine before they turn 8 months of age. Both vaccines are given by putting drops in the infant’s mouth.
What is the latest immunization schedule?
|National Immunization Schedule|
|Vaccine||When to give||Site|
|Pentavelant 1,2 & 3||At 6 weeks, 10 weeks & 14 weeks||Anterolateral side of mid thigh-LEFT|
|Rota Virus Vaccine||At 6 weeks, 10 weeks & 14 weeks||–|
|Measles 1st Dose||9 completed months-12 months. (give up to 5 years if not received at 9-12 months age)||Right Upper Arm|