Answer
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Hint: The number of nodes is one less than the principal quantum number. The principal quantum number is used to describe the energy of an electron and also the most probable distance of an electron from the nucleus. It is represented by$n$.
Complete answer:
The number of nodes is the difference of principal quantum number and one. It is given by the following formula: ${\text{Number of nodes = Principal quantum number - 1}}$. Now find the number of nodes for all the given options.
$5s \to {\text{Number of nodes = 5 - 1 = 4}}$
$5p \to {\text{Number of nodes = 5 - 1 = 4}}$
$5d \to {\text{Number of nodes = 5 - 1 = 4}}$
Note that the number of nodes depends on the principal quantum number. As all have the same principal quantum number, they all will have the same number of nodes too.
Therefore, option D is the correct answer.
Additional information:
The point where the electron probability is zero is called a node. The nodes can be divided into two types for an orbital. They are: Radial node and Angular node. Radial node is also known as a nodal region. It is a spherical surface where the probability of finding an electron is zero. As the principal quantum number increases, the number of radial nodes also increases. Angular nodes are also known as nodal planes. This plane passes through the nucleus.
Note:
The total number of nodes in an orbital is equal to the difference of principal quantum number and 1. The number of radial nodes is given by$n - l - 1$. The number of angular nodes is equal to$l$. Here, $n$is the principal quantum number and $l$ is the azimuthal quantum number.
Complete answer:
The number of nodes is the difference of principal quantum number and one. It is given by the following formula: ${\text{Number of nodes = Principal quantum number - 1}}$. Now find the number of nodes for all the given options.
$5s \to {\text{Number of nodes = 5 - 1 = 4}}$
$5p \to {\text{Number of nodes = 5 - 1 = 4}}$
$5d \to {\text{Number of nodes = 5 - 1 = 4}}$
Note that the number of nodes depends on the principal quantum number. As all have the same principal quantum number, they all will have the same number of nodes too.
Therefore, option D is the correct answer.
Additional information:
The point where the electron probability is zero is called a node. The nodes can be divided into two types for an orbital. They are: Radial node and Angular node. Radial node is also known as a nodal region. It is a spherical surface where the probability of finding an electron is zero. As the principal quantum number increases, the number of radial nodes also increases. Angular nodes are also known as nodal planes. This plane passes through the nucleus.
Note:
The total number of nodes in an orbital is equal to the difference of principal quantum number and 1. The number of radial nodes is given by$n - l - 1$. The number of angular nodes is equal to$l$. Here, $n$is the principal quantum number and $l$ is the azimuthal quantum number.
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