Question

what things can we conclude by seeing electronic config of an element.Please explain in terms of grp no, period, etc

Answer 1

the highest value of principal quantum number gives the period number

Answer 2

hmm and??

Answer 3

half filled or full filled,and correspondingly its stability.

Answer 4

How many elements should be there in total if all th 7s 7p 6d and 5f block are to be full

Answer 5

help me here please ^^^

Answer 6

doesnt 7s fulfilled mean that 1s,2s,3s,4s...6s fulfilled..how can 7s be filled wothout these getting filled earlier

Answer 7

ok ok I thought that it was saying to calculate elements in nly these 7s, 7p ...

Answer 8

i think the question meant how many elements would you find in the periodic table if elements were discovered upto that which has filled 5f shell

Answer 9

so 7*2 means - 2 for 1s, 2 for 2s, 2 for 3s, 2 for 4s, 2 for 5s, 2 for 6s, 2 for 7s =14

14 for 4f , 14 for 5f = 28
10 for 3d, 4d, 5d, 6d = 40
6 for 2p, 3p, 4p, 5p, 6p, 7p= 36
TOTAL = 118
elemets I GUESS IS THE CORECT ANSWER

Answer 10

correct

Answer 11

M I RIGHT??

Answer 12

totally....i think i should relearn multiplication..silly mistakes i make.but yes, i think you are correct.my final answer came same as you

Answer 13

NO NO u was mistaken in taking 5 * 14 while there are no f orbital for 1, 2, 3 so it was 2*14
and u took 7*6 but 1 dont have p orb so it was 6* 6
also 6*d should have taken as 4*6 bcz thr are no d orbital for 1,2,

Answer 14

*were

Answer 15

although Im not sure abt my answer...I would lke anyone to verify my answer

Answer 16

instead of writing 5f, i wrote 5*14. and to do shortcut,u make some mistakes

Answer 17

i didnot make the mistake of couting d... i know which n corresponds to which l....although it may look different, i know it was computation mistake...i had it right in my mind........so i realize that jaldi karne se galti hota hai

Answer 18

ok ok r u sure ki this answer is right??

Answer 19

checked again and again this time..dont feel so...feel pretty confidant...which class are u in...ur question gave me an opportunity for revising atomic structure. thanks

Answer 20

which city?

Answer 21

new del

Answer 22

my 11 board exams going on and am from kolkata. if u have more questions,do ask.

Answer 23

yes i will... i will for sure ... i am dumb in my studies...specially in chem

Answer 24

doesnt matter. do differently in 12. u sound to do goog

Answer 25

ok tell me
n, l,m for 3px orbital

my answer is n=3 , l= 0,1,2 and m= 1, 2, -1, -2
m I right???

Answer 26

for m , its -l to +l , that includes 0 . so -2,-1-0,1,2. remember that number of values of m is equal to 2l +1

Answer 27

obvoiusly -0 =0

Answer 28

also magnetic spin quanum no= +1/2 , -1/2 and what u said above that m= 0,1,2 ,-1,-2 OK?
ha ha -0 =0

Answer 29

it may sound simple,but one day i was asked to prove -0 = 0 . even that + - we use has a lot of mathematically hifis attached

Answer 30

m= 2l +1 . so there should be 5 values of m , putting l =2 and m ranges from -l to +l

Answer 31

ok next one is-
here 0.280g of Fe is treated with excess of (BaOH)2. Cal the weight of precipitate.
eqn is

Fe2 (SO4)3 + 3Ba(OH)2 ---> 2Fe (OH)3 + 3BaSO4

(at mas Fe-56, Ba-137, O-16 H-1 S-32)

Answer 32

would u prefer i do by unitary method,or ratio method, or poac theory or number of equivalence

Answer 33

my answr is 1.165 gm please chk , and do wth any method i just need to chk answers

Answer 34

0.28 gram ferrous sulphate or fe?

Answer 35

Ferric ions sorry

Answer 36

0.28 gram of ferric sulphate then?

Answer 37

this is the point to think---> 0.280 of Ferric ions is reacted .and we have to find BaSO4 (which is precipitate)

Answer 38

mine is coming 0.1498. dont your book have ans at the back

Answer 39

no
please share steps

Answer 40

number of equivalence for any reaction is constant. number of equivalence = weight of sample divided by equivalent weight. do it in your calculator. valency factor ferric sulfate is 6 and that for ferric hydroxide is 3

Answer 41

ok i will do later i think i need to re think.
now next
Determine the molecular formula of a compund which contains 2.19% H, 12.8% C , 85% Br . 1g of compund occupies 119 ml of volume at stp .

Answer 42

take ratio of percentages and atomic weight. then take them to their simple whole number forms. ths gives ratios of atomicities of compoung..i.e emperical formula...