Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Chemical bonding : The present matter of earth contains atoms bound in groups of two or more called molecules. Their binding capacity is called chemical reactivity; It depends upon the number of electrons in their outermost shell. When the number of shells is more than one maximum seven the first shell nearest to the nucleus can have maximum two electrons the second one can have maximum 8,third one as many as 18 fourth 32,fifth 32,sixth 18and seventh only two. Whichever it may be the outermost shell can never have more than 8electrons.Thus the presence of 8 electrons in the outermost shell represents the stability of an atom. In chemical bonding, the reactive atoms tend to gain stability either by covalent bonds electrons of their outermost shells, or by transferring ionic or electrovalent bonds electrons from one to the other. For instance, a molecule of water is formed by covalent bonding of two hydrogen atoms with an atom of oxygen atom has two electron shells. That of hydrogen atom has a single electron instead of the maximum two it can have. Similarly, the outermost shell of oxygen has only 6 electrons instead of 8 it can have. Obviously, an oxygen atom binds with two hydrogen atoms to complete the electron the electron number of8 in its outermost shell, while each hydrogen atom completes the number of two electrons in its shell, all by mutual sharing.
In another example, an atom of sodium combines with an atom of chlorine to form common salt (NaCI) sodium atom contains 11 electrons in 3 shells (2,8,1,) Chlorine atom contains 17 electrons in 3 shells(2,8,7,) To gain stability, chlorine atom takes up the lone electron of the outermost shell of sodium atom, while the latter easily loses this shell. Thus due to change in their electrons both atoms become electrically charged ions. Losing of an electrons by an atomic such electrovalent bonding is called its oxidation, and gaining of an electron by an atom is called its reduction.
Autotomy and Regeneration Shedding of body parts in self-defense to avert the attention of the predator-enemy or in any other emergency is a type of autotomy (auto: self, tom
on line mitochondria lab
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
Why is it important to be familiar with the laboratory apparatus and their uses? If you do not use instruments or lab apparatuses correctly (or use an apparatus for something i
In Reggie's case, he fractured the proximal end of his right femur, an integral component of his hip. Name the joint disorders that Reggie is more a risk of in (a) the short term a
Indications for Gingival Curettage - Endodontic Surgery a) Persistent periradicular pathosis following endodontic treatment, b) Periradicular lesion that enlarges after endo
Define Categories of Fatty Acids? The fatty acids can be discussed under following heads: Saturated and Unsaturated, Short chain, medium chain and long chain,
Define Probability concept of requirements vs risk of deficient and excess intake? Figure best illustrates the concept of a requirement for an essential nutrient. The relations
Q. What do you mean by Hypertension? Hypertension is one of the major risk factors for cardiovascular disease. It is the most common public health problem and often referred to
Describe the methods that are used for the isolation and identification of bacteria.(20 marks)
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd