To find how many proper subsets there are in a set you can use the formula n^2 -n and if you would also like to find all subsets including improper the formula is n^2 -n +1
Ammonia consists of the elements called Nitrogen and Hydrogen, froming the formula NH3.
Assuming no restrictions on the set, the cardinality of a set, n, is related in this form # of subsets = 2n
group 1 elements.
Cardinality is simply the number of elements of a given set. You can use the cardinality of a set to determine which elements will go into the subset. Every element in the subset must come from the cardinality of the original set. For example, a set may contain {a,b,c,d} which makes the cardinality 4. You can choose any of those elements to form a subset. Examples of subsets may be {a,c} {a, b, c} etc.
Nitrogen, oxygen, and the combined element to form nitrate.
CaF2
Yes; these elements can form an ionic compound named calcium sulfide, with formula CaS.
The elements Carbon, and 2 Oxygen atoms form CO2 or Carbon Dioxide.
Ca2+ + 2 I- --> CaI2
This is based upon the chemical characteristics of the elements that are present within the molecular formula.
AlF3. Aluminum trifluoride.