Two nuclides are isotones if they have the very same neutron number N, but different proton number Z. For example, boron-12 and carbon-13 nuclei both contain 7 neutrons, and so are isotones . Similarly, 36S, 37Cl, 38Ar, 39K, and 40Ca nuclei are all isotones of 20 because they all contain 20 neutrons. Despite its similarity to the Greek for "same stretching", the term was formed by the German physicist K. Guggenheimer by replacing the "p" in "isotope" with "n" for "neutron".
The largest numbers of observationally stable nuclides exist for isotones 50 (five; 86Kr, 88Sr, 89Y, 90Zr, 92Mo) and 82 (six; 138Ba, 139La, 140Ce, 141Pr, 142Nd, 144Sm). Neutron numbers for which there are no stable isotones are 19, 21, 35, 39, 45, 61, 89, 115, 123, and 127 or more. In contrast, the proton numbers for which there are no stable isotopes are 43, 61, and 83 or more. This is related to nuclear magic numbers, the number of nucleons forming complete shells within the nucleus, e.g. 2, 8, 20, 28, 50, 82, and 126. No more than one stable nuclide has the same odd-neutron-number, except for 1 (2H and 3He), 5 (9Be and 10B), 7 (13C and 14N), 55 (97Mo and 99Ru), and 107 (179Hf and 180mTa). Odd neutron numbers for which there is a stable nuclide and a primordial radionuclide are 27 (50V), 65 (113Cd), 81 (138La), 85 (147Sm), and 105 (176Lu). Neutron numbers for which there are two primordial nuclides are 88 (151Eu and 152Gd) and 112 (187Re and 190Os).
I'm right behind you, watching every step that you take, waiting for an honest
Word to pass your lips waiting for the unjust sentence
I see it in you something very far from justice something I can taste and smell
And feel and hear even though your darkness blinds me
And you know they all listen when I speak my mind
And you know that is something you can't achieve
So I rise up above your spineless cause
And I wear a pride that you never thought was real
I am all you wish to be 'cause I feel it inside
I will not be checking in as it's in my blood
I know it's in you the jealousy that clouds your judgement, making every thing
You say become hollow, twisted and distorted from truth
And you know they all listen when I speak my mind
And you know that is something you can't achieve
So I rise up above your spineless cause
And I wear a pride that you never thought was real
I am all you wish to be 'cause I feel it inside
I will not be checking in as it's in my blood
I am what you fear the most 'cause I do it well
And I know you feel this too
I absorb your energy it keeps me breathing
I will stand to watch you fall to watch you fall into a state of teething
I adore the sacredness of being stronger
And I lurk behind a smile
I am all you wish to be
I have what you need to steal
And I know you won't succeed
'Cause I see things differently
Have I not been there for you?
Have I not stood up for you?
Can you ever let it go?
I am me...