Q2. Certain mass of gas expanded from 2L and 2atm in two step. In step one expanded to external pressure equals 1.2 atm. In step 2 expanded to external pressure equals 0.7 atm. Calculate the work

of this prossece?.

Since chlorine's 17 protons are greater than magnesium's 12 protons, chlorine will have a greater effective nuclear charge to draw chlorine's valence electrons closer to the nucleus and, thus, chlorine is expected to have the smaller atomic radius, while magnesium with the lower effective nuclear charge is expected  ,so the answer is Na

Explanation:

helium

has the smallest ionic radius

As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest