What are an ionic formulas?

2 Answers
Jul 16, 2018

Answer:

Ionic formulas are ions that are held together by electrostatic attraction.

Explanation:

Given: What are ionic formulas?

Ionic crystals have ionic formulas. They are held together by electrostatic attraction .

There is a positive ion known as a cation attracted to a negative ion called an anion. The positive or negative ion can be polyatomic (an ion that is a group of ions that together have a positive or negative charge).

Ionic formulas are not a molecular formula, they are what is called a formula unit, a ratio of ions.

Examples:

#ul(" Name formula unit ions ")#
sodium chloride: #" NaCl (salt) "Na^+ " "Cl^-#
calcium chloride: #" "CaCl_2 " "Ca^(+2) " "Cl^-#
barium oxide: #" "BaO " "Ba^(+2) " "O^(-2)#
iron (III) bromide: #" "FeBr_3" "Fe^(+3) " "Br^-#
ammonium sulfide:#" "(NH_4)_2S" "NH_4^+" "S^-2#
ammonium carbonite:#(NH_4)_2CO_2 " " NH_4^+" "CO_2^-2#

Jul 16, 2018

Answer:

Ionic formulae represent ionic compounds....i.e. they represent a definite chemical entity, a salt.

Explanation:

And ionic compounds are collections of ANIONS and CATIONS such that the resultant charge of the collection, the compound or salt, is ZERO... And so we could take a metal ion, say #M^(2+)#, and marry it up to a collection of anions....i.e. #X^-#, #CO_3^(2-)#, #NO_3^-#, #ClO_4^(-)#, #HPO_4^(2-)#...to give ionic salts WHICH ARE NEUTRAL...i.e. #MX_2#, #MCO_3#, #M(NO_3)_2#, #M(ClO_4)_2#, #MHPO_4#...