State the color of methyl orange in a sample of NaOH

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )