Atoms of mg combine with atoms of f to form a compound. atoms of which of the following elements combine with atoms of f in the same ratio?

al
li
cl
ba

The atom that will combine with F in the same ratio as it combines with Mg is Ba.

We must recall that F combines with atoms of  elements group 2 to form ionic compounds of the sort MX2 where M is the metal.

Mg and Ba all belong to group 2 hence they will form compounds with F in the ratio of 1:2

Therefore, the atom that will combine with F in the same ratio as it combines with Mg is Ba.

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the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.