What is the hybridization of the central atom in the phosphorus tetrabromate PBr4 anion

50 pts plz what is the physical state of matter of baking soda.

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.

One nanometer is equal to how many meters?