Halogens. Ex. fluorine can be the gas,bromine can be the liquid, and iodine could a solid all under room conditions.
The mineral is calcite.
Lustre — glassy; ∴ non-metallic
Hardness — between a fingernail (2.5) and a penny (3)
Streak — white
Specific gravity — 54/20 = 2.7
Colour —white
Acid reaction — Fizzes; ∴ a carbonate
The only carbonate mineral that satisfies all these criteria is calcite, CaCO₃.
When solid melts, the temperature of the substances increases and the substance absorbs heat energy, converting the solid to a liquid.
So in order to answer this question you need to know how many moles are in 36.8g of magnesium. A mole of magnesium has a mass of 24.3 grams. 36.8/24.3 is about 1.51. This is how many moles are in 36.8 g of magnesium. Now you multiply this number by Avagadro's number which is 6.022E23. The total should be 9.12E23 atoms of magnesium.