List one characteristic of each of the element groups listed below. • Alkali Metals
• Alkaline Earth Metals
• Halogens
• Noble Gases

Alkali Metals have the high thermal and electrical conductivity, lustre, ductility, and malleability.

alkaline earth metals are shiny, silvery-white, and somewhat reactive metals at standard temperature and pressure.

halogens have relatively low melting and boiling points that increase steadily down the group. near room temperature halogens span all of the physical states.

all noble gasses conduct electricity, flouresce, are odorless and colorless, and are used in many conditions when a stable element is needed to maintain a safe and constant enviroment.

Explanation:

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !