1s2 2p1 excited state or ground
Ground
1s2 2s1 would be the ground date of Li.
The notation "1s2 2p1" represents the electron configuration of an atom. It tells us how electrons are distributed among the different energy levels and orbitals in an atom.
In this case, "1s2" means that there are 2 electrons in the 1s orbital, which is the closest to the nucleus and has the lowest energy.
"2p1" means that there is 1 electron in the 2p orbital, which is the next energy level after the 1s orbital.
To determine whether this configuration represents the ground state or an excited state, we need to compare it to the electron configuration of the ground state of the atom in question. The ground state electron configuration is the arrangement of electrons that corresponds to the lowest possible energy for that atom.
If the given electron configuration matches the ground state electron configuration, then it represents the ground state. If it does not match, then it represents an excited state.
To determine the ground state electron configuration of an atom, you typically need to refer to the periodic table. The periodic table provides the order of filling for the different orbitals, following a pattern of increasing energy.
In the case of "1s2 2p1", let's assume we are referring to the electron configuration of boron (B). The ground state electron configuration of boron is 1s2 2s2 2p1. So, the given configuration "1s2 2p1" does not match the ground state configuration and represents an excited state.
To verify this, you can refer to a periodic table or use online resources that provide electron configurations for different elements.