As the elements in Period 2 of the Periodic Table are considered in succession from left to right, there is a decrease in atomic radius with increasing atomic number. This may best be explained by the fact that the... 1number of protons increases, and the number of shells of electrons remains the same
2number of protons increases, and the number of shells of electrons increases
3number of protons decreases, and the number of shells of electrons remains the same
4number of protons decreases, and the number of shells of electrons increases

The answer to this is the 3rd choice!

The answer is just took the test

I'm pretty sure the answer is alcohol 

Electron equations of the given changes are as follow,a)                              cu      →      cu⁺²  + 2e⁻b)                              mg⁺²  +  2 e⁻      →      mgc)                              cl⁻    →      cl  +  1e⁻d)                              s  +  2 e⁻    →      s²⁻e)                                o²⁻      →      o  +  2 e⁻f)                              p  +  3 e⁻    →      p³⁻g)                              fe²⁺    →      fe³⁺  + 1 e⁻h)                              s²⁻    →      s⁴⁺  +  6 e⁻