InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
How the number of electron is equal to period pls explain with examples |
|
Answer» Because the n.c.e.r.t has not given the line of quantum number but thank you for the link https://youtu.be/TIxiDESxc0I ☝️☝️☝️☝️☝️Chemistry 3.1 Introduction to the Periodic Table – YouTube...................,...........................https://courses.lumenlearning.com/boundless-chemistry/chapter/the-periodic-table/ Can you don\'t tell according to n.c.e.r.t lines which can be easier for understanding ANSWER=.................Prediction of Period\xa0⟶\xa0In the electronic configuration of an atom, the principal quantum number (n) of the valence electrons represents the period of an element..... .. .. . ... ... ...Prediction of Block\xa0⟶\xa0The orbital out of\xa0s,p,d\xa0and\xa0f\xa0which receives the last electron represents the block of an element.............................. .......................Prediction of Group\xa0⟶\xa0The group prediction occurs with the help of block as:-...............................................(1) For s block: Group Number = Number of valence\xa0e− .........................(2) For d block: Group Number = Number of\xa0e−\xa0in\xa0(n−1)d\xa0subshell + number ............................ of\xa0e−\xa0in\xa0ns\xa0subshell ..... ... .(3) For p block: Group Number = Number of valence\xa0e−+10 ...... B.....(4) For f-block: Group Number =\xa03\xa0(always) ........ For example for chlorine with\xa0Z=17 ....... ...Electronic configuration =\xa01s22s22p63s23p5 .. ....Since the last\xa0e−\xa0enters in\xa0p\xa0- subshell: ...... ...(i)\xa0∴\xa0Block will be\xa0′p′ . ......(ii) For group we have element in\xa0p-block ... .. ∴\xa0Group number =\xa010+\xa0Valence\xa0e−\xa0in\xa0s\xa0subshell\xa0+\xa0Valence\xa0e−\xa0in\xa0p\xa0subshell . ... . . . Group Number =\xa010+2+5=17 . . (iii) For period . .The quantum number of valence\xa0e−=3 .. .∴\xa0Period number =\xa03 |
|