2. F2 (g) + SrCl2 (aq)
--->
SrF2 (aq)
+ Cl2 (g)
Complete lonic:
Net tonic:

see explanation

Explanation:

The molecular equation => F₂(g)  +  SrCl₂(aq) => SrF₂  + Cl₂(g)

Ionic Equation:  shows all species involved in the reaction. For the ionic reaction given the ionic equation should show all substances in reaction in ionic form along with the molecular formulas of non-ionic compounds. In general, salts that contain a metal and nonmetal that undergo ionization when dissolved in water.  

The ionic equation => Show ionic compounds in ionized form with oxidation states. Do not ionize weak acids weak bases ( molecular compounds.

=>  F₂(g) + Sr⁺² + 2Cl₋ => Sr⁺²(aq) + 2F⁻ +  Cl₂(g)

The net ionic equation =>  shows only species directly involved in the chemical process. If in the net ionic equation that are equivalent on both sides of the working equation, one should remove those compounds from the ionic equation showing only the species involved in the chemical reaction process.  

=>  F₂(g) + Sr⁺²(aq) + 2Cl⁻(aq) => Sr⁺²(aq) + 2F⁻(aq) +  Cl₂(g)

Note that Sr⁺²(aq) is found on the reactant and product sides of the equation. Cancelling Sr⁺² gives the net ionic equation.

=>   F₂(g) + 2Cl₋(aq) =>  2F⁻(aq) +  Cl₂(g)

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explanation:

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6