two different atoms have nine protons each and the same mass. however, one is neutral while the other has a negative charge. describe what each atomic structure could be, listing the possible number and location of all subatomic particles.

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.