Question

State the guideline you can use to predict the formula of:

Answer 1

We can predict formula of ionic compounds by:

• Take a look at where the elements are listed on the periodic table.
• The amount of electrons that an element would need to gain or lose in order to resemble an atom of a nearby noble gas is one of the similarities that atoms in the same column as one another (group) tend to display.
• Alkali metal group I ions have +1 charges.
• Alkaline earth metals (group 2 ions) have a +2 charge.
• Nonmetal group 6 ions have a charge of -2.
• Halides in group 7 have a -1 charge.
• The charges of the transition metals cannot be predicted in a straightforward manner.
• Check out a table of charges (valences) to see potential values. The +1, +2, and +3 charges are most frequently employed in beginning and general chemistry courses.
• Keep in mind that the positive ion is always stated first when writing an ionic compound's formula.

These are the few guidelines we can use to product formula.

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