Chlorine
The element with the electron arrangement 2-8-7 is fluorine, which has the atomic number 9. Fluorine has 9 electrons, arranged as 2 in the first energy level, 8 in the second energy level, and 1 in the third energy level.
The element with the noble-gas configuration He 2s2 2p3 is nitrogen (N), which has an atomic number of 7. This configuration represents the electron arrangement in nitrogen, where it has two electrons in the 2s orbital and three electrons in the 2p orbital.
one valence electron
Neptunium has 7 electron shells.
An atom of an element belonging to the halogen family typically has 7 outer shell electrons. Halogens are in group 17 of the periodic table, which means they have 7 valence electrons.
The element with the electron arrangement 2-8-7 is fluorine, which has the atomic number 9. Fluorine has 9 electrons, arranged as 2 in the first energy level, 8 in the second energy level, and 1 in the third energy level.
Phosphorus
An ion of bromine has the electron shell arrangement of 2, 8, 18, 7. Therefore, an atom that has the same electron shell arrangement would be one that has 35 electrons, such as the element bromine itself before it becomes an ion with a charge of -1.
Magnesium. 2+8+2=12 electrons so it also has 12 protons., Mg has proton number 12. You can tell by looking that is is in group 2 as the outer shell has 2 electrons. It has 2 filled inner energy levels and 2 electrons in the outer shell.
17(2,8,7)
[Ne] 3s2 3p5 or 2, 8, 7
The element with its outermost electron in the 7s1 orbital is francium (element 87). Its outermost electron is in the 7th energy level (n=7), specifically in the 7s subshell.
The element with 3 energy levels and 7 valence electrons in a neutral state is chlorine (Cl), which has an electron configuration of 2-8-7.
Germanium has 32 electrons in its electron cloud.
The element with the noble-gas configuration He 2s2 2p3 is nitrogen (N), which has an atomic number of 7. This configuration represents the electron arrangement in nitrogen, where it has two electrons in the 2s orbital and three electrons in the 2p orbital.
There are 7 electrons, 7 Protons, and 7 neutrons in the element Nitrogen.
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.