An example of a physical property of an element is the element’s ability to(1) react with an acid(2) react with oxygen(3) form a compound with chlorine(4) form an aqueous solution

Answer is: 4) form an aqueous solution.

Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the change.  Making aqueous solution is physical change (solvatation).

Element reactions with acids, oxygen and chlorine are chemical change (chemical reaction combustion), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change (exothermic reaction because energy is released).

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter