1. This question is about zirconium (Zr).

a. How many protons, neutrons, and electrons are in *Zr and *Zr++?

b. Write the ground state electron configuration of 92Zr and 9²Zr++

c. In your own words, define the term isoelectronic.

d. Give one example of an atom or element that is isoelectronic with $2Zr**

e. Using ⁹2Zr and $5Zr as an example, explain in your own words what an isotope is.