fluorine
1 inn the outer shell; Al has an electronic configuration of [Ne] 3s2, 3p1. In level 2 all three of the 2p orbitals are occupied by 2 electrons making 6 p electrons at this level. In total Al has 7 electrons in p orbitals.
Electrons are arranged in electron clouds around the nucleus. The reactivity is determined by the number of valence electrons, or electrons in the outermost energy levels. All atoms (except for hydrogen who wants 2 electrons and boron who wants 6) want 8 valence electrons, or a full outer energy level. This makes them stable (like the noble gases). If an atom has 1 valence electron it will desperately want to lose that electron while an atom with 7 electrons will want to gain one electron. All atoms have the goal of 8 valence electrons. Also, the 1st energy level only has 2 electrons. After that there is 8 electrons (approximately, because you can never truly determine where an electron is inside of an atom at any given time).
I am pretty sure it's one because the highest is 7 and the farther away you are the lower the energy level!
A halogen is located in group 17 of the periodic table, so the electron configuration for the valance electron would be ns2np5 (n=energy level). So all halogens have 7 valance electrons.
Halogens have 7 electrons in last orbit. They disparately want one electron to fill there last orbit. So they will simply hold the electrons tightly and as you know, for electricity to flow there should be free electrons. They will not give electrons so easily as metals do, who wants to get rid of extra electron/electrons to fill there outer orbit. If very high voltage is applied halogens may be forced to conduct electricity and Nobel gases will give up before halogens, when forced to conduct electricity.
7
Group seven elements have 7 electrons in their outermost energy level.
7
Nitrogen has 5 electrons in its outer shell, and Bromine has 7 electrons in its outer shell.
7
it has 2 because the first energy level has 1
The halogens have 7 electrons in their outer shell desparate to gain the 1 electron to make a full shell of 8 electrons.
Outer electrons, or Valence Electrons, for nitrogen is 5 electrons. The first electron level requires 2 electrons, an electron pair, to fill it and move on to the next level. Nitrogen has 7 electrons, so 7-2=5.
Nitrogen has two energy levels. The first energy level contains two electrons. The second energy level contains five electrons. Number of Protons/Electrons: 7 Number of Neutrons: 7
7Fluorine has 7 electrons in the outer level.
it has 7 valence electrons, which is the number of electrons on the outer energy level, so it needs 7.
Chlorine has atomic number 17, so it has 17 electrons. They are arranged as 1s2 2s2 sp6 3s2 3p5. Thus, the outer energy level (n=3) has 7 electrons (2 in the 3s and 5 in the 3p).