Sr, Strontium (atom no. 38)
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.
It has 39 electrons and ends in a d orbital. Now finish your homework :)
Two aluminum atoms and three sulfur atoms are combined in the compound aluminum sulfide (2 Al + 3 S = Al2S3).
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.
All alkaline earth metals have electron configurations ending in s2; 6s2 would be the alkaline earth metal in period 6 of the PTE, which is barium.
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.
It has 39 electrons and ends in a d orbital. Now finish your homework :)
Two aluminum atoms and three sulfur atoms are combined in the compound aluminum sulfide (2 Al + 3 S = Al2S3).
Technetium (Tc)Long way: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d5Short way: [Kr] 5s2 4d5
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.