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.
Ganglia - Organisation of Nervous System In between higher non-chordates with a central nervous system, you will observe that the association neurons and motor neurons are con
According to the function of the transmitted neural impulse which are the types of neurons? How different are the concepts of afference and efference of the neural impulse transmis
What do you understand by Dimorphic nuclei? Organization of the nuclear material typical of ciliates. There is always a single small micronucleus and either one large or many m
Define the Streak Plate Method - Pure Culture Techniques? The method was developed by Loeffler and Gaffkey in the laboratory of Robert Koch. The streak plate method depends on
Which of the following structures in a vertebrate with a four-chambered heart would have blood with the highest oxygen concentration? And why?
At 1 AM, a healthy squid giant axon is placed in a bath of normal squid physiological extracellular saline and is internally perfused with normal squid intracellular saline. I
Why should you not apply cosmetics while doing a lab experiment in class?
why should breathe faster after a hard work
What is the Mendel's first law? The Mendel's first law postulates that a characteristic (trait) of an individual is always verified by two factors, one inherited from the fathe
The luria-nebraska neuropsychological battery This procedure was first reported in 1978 in the form of two initial validity studies. Historically, Chirstensen, a student of the
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