Question 4.1: Why do atoms react? Answer: In periodic table, each period starts with alkali metal (except first period) and ends at noble gas. As noble gases do not participate in the chemical reaction, so these elements are also called innert gases. They are stable and innert due stable electronic configuration in their valence shell (i.e, ns 2 , np 6 ). The other elements also have tendency to attain noble gas electronic configuration. So, due to this reason, each element reacts. Question 4.2: What is doublet rule? Answer. Tendency of an atom to acquire 2 electrons in its valence shell is called duplet rule. Question 4.3: what is octet rule? Answer. The tendency of an atom to acquire 8 electron in its valence shell is called octet rule Question 4.4: Find the number of valence electrons in the following atoms using periodic Table . A. carbon B. magnesium C. phosphorus Solu...
We provide all level's students with simple and easy notes on chemistry. These notes include chemistry notes according to FBISE syllabus and solved exercises.