In which of the following is the number of neutrons correctly represented? Group of answer choices

In Mg-20, Mg has 12 neutrons.

In F-19, F has 0 neutrons.

In U-238, U has 146 neutrons.

In As-38, As has 38 neutrons.

Why are the trends and exceptions to the trends in ionization energy observed?

Draw the lewis dot structure for each of the following polyatomic ions

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.