IMAT Biology Lesson 1.1 | Biochemistry | Weak Interactions

[Music] hi this is andre from med school eu and we're going to begin our course with section 2 of the imat which is biology and we're going to start right from the top of the imat specifications with the unit of the chemistry of living things which is simply biochemistry and the first topic that we'll cover

in this video will be the biological importance of weak interactions all right so before we dive into weak interactions we must first brush up on a little bit of on basic chemistry and atomic structure so here we have two atoms sodium and chlorine and first we must know how atoms exchange electrons in order to

form interactions and form bonds within each other which is just a theoretical basis of weak non-covalent interactions that we'll talk about in this topic everybody should be already familiar with the structure of the atom there are electrons on this atom and you should know that the most outer shell is called the valence shell

which contains electrons on it that are called valence electrons now the octet rule here states that atoms have the tendency to prefer to have eight valence electrons in its most outer shell which means that atoms are stable when they have eight valence electrons and typically when they're stable they're unreactive they do not react

very well however these these atoms here they don't have they don't fulfill the octet rule they don't have eight valence electrons because sodium only has this one electron here and chlorine has seven electrons in its valence shell so both of them do not have do not fulfill the octet rule now if if two atoms do not fulfill the

octet rule they're typically unstable and if they are unstable they're looking to become stable and therefore they're open to be reactive all right so what happens when two unstable atoms come in contact with each other is that they form interactions so typically when a sodium and a chlorine atom come together the sodium electron here has the