Because the number of protons in chlorine atom and chloride ion are the same (17 protons). The element argon has 18 protons.
Elements in Group 2 of the periodic table will have an electron configuration that ends in s2. This group includes elements such as beryllium, magnesium, and calcium. They have two electrons in their outermost s sublevel.
The electron configuration of niobium is [Kr] 5s2 4d3. When niobium forms a 2+ ion, it loses two electrons, so the configuration becomes [Kr] 5s2 4d1.
Sulfur has a 3p1 electron configuration. Aluminum ends in 3p1 when discussing electron configurations as well.
It doesn't become an argon atom because it (Cl-) still has 17 protons, and an argon atom has to have 18 protons.
The column that contains elements whose electron configuration ends with d4 is the "transition metals" column. Transition metals have partially filled d orbitals in their electron configurations, typically with the d orbitals being filled first before the s and p orbitals.
Barium (Ba) is the alkaline earth metal with an electron configuration that ends in 6s2. Its full electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2.
The 3p1 electron configuration belongs to phosphorus with the electron configuration 1s2 2s2 2p6 3s2 3p1. This means that phosphorus has 15 electrons, with the last electron occupying the 3p subshell.
Because the number of protons in chlorine atom and chloride ion are the same (17 protons). The element argon has 18 protons.
The atomic number for sulfur is 16. That means that its electron configuration is 1s2 2s2 2p6 3s2 3p4. This can be shortened to [Ne] 3s2 3p4, which shows you that 3s2 3p4 is how sulfur's electron configuration ends.
The element with the electron configuration of 2s2 2p4 is Oxygen (O), which has 8 electrons in total.
Elements in Group 2 of the periodic table will have an electron configuration that ends in s2. This group includes elements such as beryllium, magnesium, and calcium. They have two electrons in their outermost s sublevel.
The element with an electron configuration that ends with 3p is silicon, with the electron configuration 1s2 2s2 2p6 3s2 3p2.
The electron configuration of niobium is [Kr] 5s2 4d3. When niobium forms a 2+ ion, it loses two electrons, so the configuration becomes [Kr] 5s2 4d1.
Sulfur has a 3p1 electron configuration. Aluminum ends in 3p1 when discussing electron configurations as well.
The electron configuration that ends in 4d5 is Kr 5s1 4d5, which refers to krypton and the arrangement of its electrons in the 5s and 4d orbitals.
The element in question has an atomic number that is 2 less than element C and its electron configuration ends in 3d9. This would suggest that the element is one of the transition metals that comes before element C in the periodic table. A possible candidate fitting this description is manganese (Mn), which has an atomic number of 25 and an electron configuration of [Ar] 3d5 4s2.