Which element has the following electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2?

Question

Cab. Snc. Rbd. Sr

Alphonso Olson · Accepted Answer

first of all this is a bad question. why? because the number of PROTONS determines what element you have. not the number of ELECTRONS. Ions are real right?and IF the atoms this question is refering to are 1) neutral atoms, 2) have no higher energy level electrons THEN it would be Strontium. How can you tell? One of two ways. you can count up the electrons as the other answerer did and say # protons = # electrons in a neutral atom and atomic # = # protons. then look for atomic # = 38Or you could get familar with electronic configuration by looking at the orbitals tab on this periodic tablehttp://www.ptable.com/ and moving around and observing how electrons fill. the left two columns are “s” electrons. the right 6 columns are “p”. the middle are “d”… the actinide and lathanide are “f”and for “s” and “p” electrons, the row = # in front of the letter… 5S2 means 5th row. 2 s electrons. 5th row 2nd column… Strontium.BUT all that said……..Y(+1), Zr(+2), Ni(+3), Mo(+4), etc also have that same electronic configuration.

Alphonso Olson · Answer

Total number of electrons = 2 + 2 + 6 + 2 + 6 + 2 + 10 + 6 + 2 = 38It means the atomic number is 38.This implies that the element is Strontium.So the correct answer is :d. Sr

Alphonso Olson · Answer

Kr = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 Mn = 1s2 2s2 2p6 3s2 3p6 4s2 3d5 or [Ar] 4s2 3d5 Bk = [Rn] 7s2 5f9 Zn = [Ar] 4s2 3d10 Zr = [Kr] 5s2 4d2 Br = [Ar] 4s2 3d10 4p5 Sb = [Kr] 5s2 4d10 5p3 Re = [Xe] 6s2 4f14 5d5

Lori Robel

Which element has the following electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2?

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