Question

What is the differences between :

Mass-to-charge ratio

Charge-to-mass ratio

Charge-to-size ratio

I'm confused about these three terms ?

Answer 1

1) Mass-to-charge ratio = mass/charge

   mass to charge ratio = m/z   = atomic or molecular mass/charge

The number of electrons removed is the charge number (for positive ions). m/z represents mass divided by charge number

example : for Cl⁺       mass to charge ratio = 35.5 /1

                    for Mg+2   ion mass to charge ratio = 24 /2

                   for CH3COO-    ion mass to charge ratio = 59/1

2) Charge-to-mass ratio    

it is completely reverse of first one  

Charge-to-mass ratio   = charge/mass

                                    = z/m

example :

for Cl+    Charge-to-mass ratio = 1/35.5

for Mg+2    Charge-to-mass ratio = 2/24

3) Charge-to-size ratio   = charge/size

Examples:

suppose Mg+2 size= 0.65A⁰

              Ca+2 size= 0.99A⁰

              Sr+2 size= 1.13A⁰

charge to size ration of Mg+2    = 2/0.65

charge to size ration of Ca+2    = 2/0.99

charge to size ration of Sr+2    = 2/1.13