an atom in its ground state contains 18 electrons . how many of these electrons are in orbital with l=0 values
I don't think 6 is right. See my answer above.
https://www.jiskha.com/questions/1836733/an-atom-in-its-ground-state-contains-18-electrons-how-many-of-these-electrons-are-in
oops. 6 is right. I'm wrong.
To determine how many electrons in an atom are in orbitals with the quantum number l = 0, we need to understand the electron configuration.
In the ground state, electrons fill up orbitals in an atom following the Aufbau principle, which states that electrons occupy the lowest energy orbitals first. The electron configuration for an atom tells us the arrangement of electrons in its orbitals.
For example, we need to figure out the electron configuration for the atom with 18 electrons. To do this, we start by filling the orbitals in order of increasing energy.
The electron configuration for 18 electrons is:
1s² 2s² 2p⁶ 3s² 3p⁶
Now, let's take a closer look at the orbitals with l = 0. In the electron configuration, the 1s, 2s, and 3s orbitals have l = 0 because they can only accommodate a maximum of two electrons.
So, the number of electrons in orbitals with l = 0 is the sum of the number of electrons in the 1s, 2s, and 3s orbitals:
2 (from the 1s orbital) + 2 (from the 2s orbital) + 2 (from the 3s orbital) = 6
Therefore, there are 6 electrons in orbitals with l = 0 in an atom with 18 electrons.