What is electronegativity? What are the periodic trends in

Solution:Step-1A lone pair refers to a pair of valence electrons that are not shared with another atom and issometimes called a non-bonding pair. Lone pairs are found in the outermost electron shell ofatoms. They can be identified by using Lewis structure . Electron pairs are therefore consideredlone pairs if two electrons are paired but are not used in chemical bonding. In molecules, thepresence of lone electrons pushes non-central atoms toward one another. Because the only atompulling on the lone pair of electrons is the central atom, these are drawn closer to the centralatom than the non-central atoms are. Thus, the lone pairs of electrons take up more space andpush away the non-central atoms. (a) SiH 414i [Ne] 3s 3p2 1 1s 1Total number of valence electrons in SiH = 4+ 4(4=8Hence the lewis dot structure isIn case of SiH al4 the valence shell electrons of Si and H take part in bonding. So their is nononbonding electrons are present on the central atom.Molecular geometry can be predicted by VSEPR theory (steric number)Steric number(SN) = (number of atoms bonded to central ato