Excited electrons are on higher levels of the electron clouds. It takes more energy to get them to the higher level, and energy is lost when they fall. When that energy is lost, a an x-ray photon is emitted.
The electron configuration oh selenium is: [Ar]3d10.4s2.4p4.
3d
2-8-7-3
This electron configuration represents Sr or Strontium. 2-8-18-7-3 represents Sr in the excited state; 2-8-18-8-2 represents Sr in the ground state.
The electron configuration for an O2- ion is 1s22s22p6 just like the noble gas neon.
1s2 2s1 2p3 3s1
The atomic number of zinc is 30. Its abbreviated electron configuration is [Ar]4s23d10 The full electron configuration is 1s22s22p63s23p64s23d10 (configurations for the atom in its ground state. Ions and excited atoms have different configurations).
Indeterminate. There are an infinite number of possible excited states.
The electron configuration of calcium is [Ar]4s2.
This electron configuration represents Sr or Strontium. 2-8-18-7-3 represents Sr in the excited state; 2-8-18-8-2 represents Sr in the ground state.
[Ar],4s2,3d9
The electron configuration for an O2- ion is 1s22s22p6 just like the noble gas neon.
1s2 2s1 2p3 3s1
ground state
2 8 8 2
It is the electron configuration of a neutral, not excited atom.
It depends on the atom. For example, the electron configuration of an atom of boron in the ground state is 2-3. In the excited state, it would be 2-2-1. For an atom of chlorine, the ground state configuration is 2-8-7. The excited state would be 2-8-6-1. When an atom enters the excited state, an electron moves up to a higher energy level and releases energy. An electron in the excited state is not stable until it returns to ground state.
1s2 2s2 2p6 3s1 3p1
1s2 2s2 2p6 3s2 3p3 4s1
The atomic number of zinc is 30. Its abbreviated electron configuration is [Ar]4s23d10 The full electron configuration is 1s22s22p63s23p64s23d10 (configurations for the atom in its ground state. Ions and excited atoms have different configurations).