Answer:
Option A is correct.
Atomic orbitals developed using quantum mechanics describe regions of space in which one is most likely to find an electron
Explanation:
Atomic orbitals developed using quantum mechanics make use of quantum numbers.
There are four different quantum numbers that all work to give the region of space where a particular electron has the highest probability of being located.
The four quantum numbers that describes an electron's most likely location in an atom include
1) Principal quantum number, denoted by letter n. This quantum number gives the shell that an electron in an atom belongs to. It can take on natural number values from 1 (for the shell closest to the nucleus) through 2, 3, 4.... till rhe outermost shell.
2) Azimuthal/Angular Momentum quantum number, denoted by l. This quantum number describes the subshell or orbital within a shell that the electron belongs to in an atom.
It can take on values that can range from 0 to (n-1). These are the spdf orbitals with s-orbital having l-quantum number of 0, p-orbital with l-quantum number of 1 etc.
3) Magnetic quantum number, denoted by letter m. This describes the sub-orbital that the electron belongs to. It's values for electrons in a particular orbital vary from -l through 0 to +l.
E.g. orbital with l = 1 has electrons whose magnetic quantum number vary from -1, 0, +1.
orbital with l = 2 has electrons whose magnetic quantum number vary from -2, -1, 0, +1, +2.
4) Spin quantum number, denoted by letter s.
This describes the orientation of the electron's spin. Whether clockwise or anti-clockwise in it's sub-orbital. It can take on only values of (+1/2) or (-1/2).
So, these four quantum numbers, numbers that were made known because of quantum mechanics, show that atomic orbitals developed using quantum mechanics describe regions of space in which one is most likely to find an electron in an atom.
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