Question

HELP...!!! ATOMIC CHEMISTRY..!!!!
FAN + MEDAL
A certain negative ion X^-2 has in its nucleus 18 neutrons and 18 electrons in its extra nuclear structure. What is mass number of its most abundant isotope

Answer 1

@KL-RC @Koikkara @paki

Answer 2

Hi @KL-RC can u tell me how to determine "most abundant isotope" ?

Answer 3

most abundant means the one type of isotope that is found in majority to put it in the simplest form.

Answer 4

So how do i know that for element X in this question ?

Answer 5

*how to draw

Answer 6

yes i know that

Answer 7

see what i mean that, in this question element X has 16 protons and 18 neutrons, it can have an isotope having 16 neutrons or 17 neutrons or 18 neutrons...how will i determine which is the most abundant

Answer 8

great so you got yourself the answer :D

Answer 9

dont take it that way...u r saying it sulfur because we know that sulfur has atomic number 16. But i want to know if there is any way to determine this without using periodic table...

Answer 10

Oooohh ok im not sure.... :( I can tag @thushananth01

Answer 11

this website is responding very slow !!

Answer 12

I know right?

Answer 13

No the answer is still not clear, we have to find the most abundant isotope of element X which seems to be sulphur here

Answer 14

@Koikkara can u help ?

Answer 15

@hba can u help ?

Answer 16

anyways..thnx for ur help @KL-RC !

Answer 17

@Koikkara just tell me how do i determine which isotope of element X will be most abundant

Answer 18

@aaronq will help...

Answer 19

Hmm...it seems like Calculating isotopic abundances, using the given atomic weight and isotopic weights ( or by referring the exact atomic weight for each naturally-occuring stable isotope and its percent abundance. These values can be looked up in a standard reference book such as the "Handbook of Chemistry and Physics.")

Answer 20

They have told to find for the mass number which is in high abundance, so you just hve to concentrate on the mass number, There are 18 electrons in which 2 are gained, so the proton number would be 16, the number of neutrons is 16, so that would be 32(mass number) and if you wanna find the most abundant isotope, usually the most abundant isotope is the one listed on the periodic table. In that case it would be 32. If you want to calculate then you will be provided with the abundances of each isotope which would then allow u to find the most abundant one

Answer 21

@thushananth01 unfortunately, @IamStark needs to know, Is there any options to find the isotopic abundances without using Periodic Table ...I think so ? Considering the periodic table it is already given in text books and ref books too.... !

Answer 22

yes, thats right, the abundances are given in the book, or maybe in your exam booklet

Answer 23

@koikkara @thushananth01 i figured it out...the most abundant isotope will be the isotope having most stable nucleus and generally most nucleus will be in which \[\frac{ n }{ p } = 1\]

Answer 24

*most stable nucleus

Answer 25

Thanx all for ur help.