Answer:

Explanation:
Hello there!
In this case, according to the given information, it turns out firstly necessary to write out the described chemical reaction as shown below:

Now, we set up the expression for the calculation of the standard free energy change, considering the free energy of formation of each species, specially those of H2 and F2 which are both 0 because they are pure elements:

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Answer:
it is always necessary to use the roman numeral as the assigned charge of the metal.
Explanation:
This is so that one would know which Transition metal is being used. For example copper (II) would be Cu²+
Metalloid is the closest because noble gases are obviously out, nonmetals are terrible conductors, and metals are not malleable
element is made up of only one type of atoms.
it is pure form of matter
example hydrogen, oxygen, carbon etc