Respuesta :
Answer: The correct answer is [tex]^{23}\textrm{Na}[/tex]
Explanation:
The general representation of an isotope is [tex]_Z^A\textrm{X}[/tex]
where,
A = atomic mass of the element
Z = atomic number of the element
X = symbol of the element
Atomic number is defined as the number of protons or electrons that are present in a neutral atom.
Atomic number = number of protons = number of electrons
Atomic mass is defined as the sum of number of protons and neutrons that are present in an atom.
Atomic mass = Number of protons + Number of neutrons
- For [tex]^{23}\textrm{Na}[/tex]
Atomic number = 11 (Sodium)
Mass number = 23
So, from this we can easily get the number of protons, number of electrons and number of neutrons present in the given element.
- For [tex]_{11}\textrm{Na}[/tex]
Atomic number = 11
So, from this we can only get the number of protons and number of electrons present in the given element.
Hence, the correct answer is [tex]^{23}\textrm{Na}[/tex]
The symbol ²³Na provides us more information about the atom.
The general representation of an atom is [tex]^{A} _Z X[/tex] where
- X: is the element
- A: is the mass number (number of protons + number of neutrons)
- Z: is the atomic number (number of protons)
We have 2 symbols: ²³Na and ₁₁Na.
On the one hand, ₁₁Na informs us that the element is sodium and that the atomic number is 11 (11 protons).
On the other hand, ²³Na informs us that the element is sodium and that the mass number is 23. However, the atomic number for an element is always the same. Thus, knowing that the element is sodium, we know that the atomic number is 11. And we can calculate the number of neutrons as the difference between A and Z.
[tex]n^{0} = A - Z = 23 - 11 = 12[/tex]
The symbol ²³Na provides us more information about the atom.
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