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Explanation:
Isotopes are types of atoms of same element with same number of protons and electrons but differ in number of neutrons in their nucleus.
Hyphen notation is written as: Elemental Symbol - (Mass number)
Nuclear Symbol : [tex]^{A}_{Z} \text{Elemental symbol}[/tex]
a. Mass number of 28 and atomic number of 14.
The element with atomic number 14 is Silicon.
The hyphen notation for this given isotope of a silicon : Si-28.
Nuclear Symbol : [tex]^{28}_{14}Si[/tex]
b. 26 protons and 30 neutrons.
Mass number of element = 26 + 30 = 56
Atomic number of element = number of proton = 26
The element with 26 atomic number is iron.
The hyphen notation for this given isotope of a iron : Fe-56.
Nuclear Symbol : [tex]^{56}_{26}Fe[/tex]
The nuclear symbol and hyphen notation for the isotopes are Si-28 and Fe-56.
Isotopes simply mean the atoms of the same element that have the same number of protons and electrons but have different numbers of neutrons in their nucleus.
a. Since the mass number is 28 and the atomic number of 14. It should be noted that the element with atomic number 14 is Silicon. Therefore, the hyphen notation for the isotope of a silicon will be Si-28.
b. Since the element has 26 protons and 30 neutrons, then the mass number of element will be the addition of the protons and the neutrons and this will be:
= 26 + 30 = 56
Since the atomic number of an element is equal to the number of proton. This will be 26. Then, the element with an atomic number of 26 is iron.
Therefore, the hyphen notation for the isotope of an iron : Fe-56.
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