[govibe]

An ion having a 4+ charge and a mass of 49.9 amu has 2 electrons with principal quantum number n = 1, 8 electrons with n = 2, and 10 electrons with n = 3. Supply as many of the properties for the ion as possible from the information given. (Hint: In forming ions, the 4s electrons are lost before the 3d electrons.)

(a) What is the atomic number?
(b) What is the total number of s electrons?
(c) What is the total number of p electrons?
(d) What is the total number of d electrons?
(e) What is the number of neutrons in the nucleus?
(f) What is the ground-state electron configuration of the neutral atom?

HEre's what I tried. For (a), I added up all of the electrons they give, and the sum is 20. If there is a 4+ charge, then there must be 24 protons, so is 24 the answer?

For (b), if there are 2 electrons with principal quantum number n = 1, then there's only 1 s orbital, but how about the number of electrons? There is also what I had trouble with (b), (c), (d), (e)... (f), I don't really understand what it's asking.

[enahs]

A) is good.

There is more then 1 s orbital. The n = 1 has an s orbital, then n = 2 has an s orbital, then n = 3 has an s orbital.


http://www.fordhamprep.org/gcurran/sho/sho/lessons/lesson36.htm


Remember the hint also told you it has lost 4 s electron when forming the ion.

[AWK]

http://www.youtube.com/watch?v=8HhIrjTcQtc
http://education.jlab.org/qa/electron_config.html
http://www.nisd.net/communicationsarts/pages/chem/ppt/econfig_pres.ppt

[govibe]

so is this an ion with an electron configuration? (like 1s2 2s2 2p4 type of thing?)