Molten Iron.
Iron at the center and silicone at the next layer.
7
Outter core
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Yes it is. It is a noble gas, and has ten electrons in it's outer valence shell making it full.
Because of the amount of ions in there outter shell H = 1 etc
they want to fill in there outter most shell. they want to have 8 on it
There are 12 electrons in the electron shell of magnesium, the same number as protons. As for the outermost shell, it would be 3s2, meaning there are two electrons in the third "s" shell.
There is a general tendency to form an octet, to have a stable structure.
A sea turtle has an external shell.
The valence shell is the outter most shell that contains the most electrons. To find out how many valences there are you would mulitply the electrons. C3H8= (6)3 + (1)8=26 the outer valence shell will be 20.
Any noble gas (He, Ne, Ar, Kr, Xe, or Rn)
As they grow, they start to form a new softer shell beneath the outter shell. Once they are too big to stay in their old shell, they shed it, and use the new shell they've grown.