What is the maximum number of electrons that can occupy the d sublevel?

10

Explanation:

The electron configuration for an element follows some rules:

K 1s2 (2 electrons)

L 2s2 sp6 (8 electrons)

M 3s2 3p6 3d10 (18 electron)

N 4s2 4p6 4d10 4f14 (32 electron)

and so on...

But you don't do it linearly, you go 1s, 2s, 2p, 3s, 3p, 4s, 3d

And you can follow some rules if you have 24 electrons, for example, the sequence should go 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"