Respuesta :
Element with an atomic number of 58 is actually Cerium, so the symbol should be Ce, not Co because that is Cobalt which has an atomic number of 27. With that being said, the notation for isotopes is the symbol of the element with a superscript and a subscript that are aligned. The superscript represents the mass number.
Mass number = protons + neutrons = 58 + 33 = 91
The subscript is the atomic number which is 58. The notation is written in the picture attached.
Mass number = protons + neutrons = 58 + 33 = 91
The subscript is the atomic number which is 58. The notation is written in the picture attached.

The symbol for the isotope :
[tex]\large {{{91} \atop {58}} \right Ce}[/tex]
Further explanation
The elements in nature have several types of isotopes
Isotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.
So Isotopes are elements that have the same Atomic Number (Proton)
Atomic mass is the average atomic mass of all its isotopes
In determining the mass of an atom, as a standard is the mass of 1 carbon-12 atom whose mass is 12 amu
So the atomic mass obtained is the mass of the atom relative to the 12th carbon atom
[tex]\large {\boxed {mass ~ average ~ atom ~ X ~ = ~ \frac {mass\:isotope ~ 1 + mass ~ isotope ~ 2} {number ~ whole ~ atom ~ X}}[/tex]
An atomic mass unit = amu is a relative atomic mass of 1/12 the mass of an atom of carbon-12.
[tex]\large {\boxed {Ar ~ X = \frac {mass ~ average ~ 1 ~ atom ~ X} {\frac {1} {12}. mass ~ 1 ~ atom ~ C-12}}}[/tex]
The 'amu' unit has now been replaced with a unit of 'u' only
for example, Carbon has 3 isotopes, namely ₆¹²C12, ₆¹³C, and ₆¹⁴C
The Atomic Number (Z) indicates the number of protons in an atom of an element. If the atom is neutral then the number of protons will be equal to the number of electrons. So the atomic number can also indicate the number of electrons.
So atomic number = number of protons = number of electrons
Mass Number (A) is the sum of protons and neutrons
Mass Number (A) = Number of protons + Number of Neutrons
So that the relationship between atomic numbers and mass numbers can be formulated as follows:
Atomic Number (Z) = Mass Number (A) - Number of Neutrons
In the following element notation,
[tex]\large {{{A} \atop {Z}} \right X}[/tex]
Information
X = symbol of elemental atom
A = mass number
= number of protons + number of neutrons
Z = atomic number
= number of protons = number of electrons, on neutral elements
The symbol for the isotope of 58 that possesses 33 neutrons
The number of 58 indicate the Atomic Number (Z) = number of protons
And the mass number :
A = number of protons + number of neutrons
A = 58 + 33
A = 91
Whereas the element that has atomic number 58 is must be Serium (Ce)
So the symbol for the isotope :
[tex]\large{\boxed{\bold{ {{{91} \atop {58}} \right Ce}}}}[/tex]
Learn more
element X
https://brainly.com/question/2572495
the chemical symbols
https://brainly.com/question/8698247
two stable isotopes of bromine
https://brainly.com/question/1915462
Keywords : the symbol,the isotope, Ce, atomic number , mass number
