Use the following key to classify each of the elements below in its elemental form: A. Discrete atoms ...
B. Molecules ...
C. Metallic lattice
D. Extended, three-dimensional network
1. Argon
2. Bromine
3. Nitrogen
4. Fluorine

Discrete atoms

Argon

Molecules

Bromine

Nitrogen

Fluorine

Explanation:

The existence of substances in the elemental form depends on the nature of the substance.

Argon is a noble gas hence it seldom participates in chemical combination therefore it exists as discrete molecules in elemental form.

Bromine, fluorine and nitrogen all exist as diatomic gases because they combine readily with each other to form elemental molecules. An elemental molecule is a molecule composed of the atoms of the same element.

"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"