Hi could anyone please be nice to answer my chemistry question?

Question

Write the electron configurations for the following atoms and for the simple ion that the element most commonly forms.
a. magnesium
b. lithium
c. selenium
d. radium
e. nitrogen

Answer 1

I'll do one for you and then you can try the rest.

Magnesium has 12 electrons, so follow your filling order. Each s orbital holds to electrons and each p orbital holds 6, so its:

1s2 2s2 2p6 3s2

It has 2 electrons in its outer shell so to have a full outer shell it will lose 2 therefore the common ion It forms is Mg2+

Answer 2

A. Magnesium = 1s2 2s2 2p6 3s2

B. Lithium = 1s2 2s1

C. Selenium = 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4

D. Radium = 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d10 6f14 7s2

E. Nitrogen = 1s2 2s2 2p3

Hope this helps!

Answer 3

a. magnesium= 1s^2 2s^2 2p^6 3s^2

b. lithium = 1s^2 2s^1

c. selenium= 1s^2 2^s2 2^p6 3^s2 3p^6 3d^10 4s^2 4p^4

d. radium= 1s^2 2^s2 2^p6 3^s2 3p^6 3d^10 4s^2 4p^6 4d^10 5s^2 5p^6 4f^14 5d^10 6s^2 6p^6 7s^2

e. nitrogen= 1s^2 2s^2 2p^3

The websites below might be useful in learning/practicing how to write electron configurations:

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

http://intro.chem.okstate.edu/1215/Lecture/Chapter11/Fri112098.html

Hope this helps... Good luck! ;-)

Answer 4

a. Mg: 1s2 2s2 2p6 3s2
Mg2+: 1s2 2s2 2p6

b. Li: 1s2 2s1
Li+: 1s2

c. Se: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4
Se2-: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6

d. Ra: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6d6 7s2
Ra2+: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6d6

e. N: 1s2 2s2 2p3
N3-: 1s2 2s2 2p6

Answer 5

Read your text book. Look up the elements in the periodic table. Then, if you still need assistance, ask.

Answer 6

e