Ionization energy increases as you move left to right in a period . that's why noble gases have high ionization energies.
shielding effect increases from top to bottom in a group atomic size also increases from top to bottom in a group
The answer is 2, liquid to vapor because vaporization is the process of liquids to vapors.
Pretty sure 1d is not a real thing
Answer:
the mass number is 40 g/mole
