<span>The number of moles of Cl- ions needed to combine completely with 0.25 mole of Mg+2 ions is:
0.50.</span>
your answer is c) lead. because a leaded stained glass was used with lead glass which holded the pieces together.
The correct response is A. The inner she'll contains 2 electrons and the outer shell contains 4 electrons.
EXPLANATION :
mass is the quantity of matter in an object .
volume is the amount of space that something contains or fills .
density is the thickness of a solid , liquid or gas measured by its mass per unit of volume.
Thanks I did what I can hope it helped...