A Behr model for Rubidium would have how many shells/rings? A 5 6

The correct answer is **A. 5**.<br /><br />Rubidium (Rb) has an atomic number of 37. This means it has 37 electrons. The electron shells fill up as follows:<br /><br />* **Shell 1:** 2 electrons<br />* **Shell 2:** 8 electrons<br />* **Shell 3:** 18 electrons<br />* **Shell 4:** 8 electrons<br />* **Shell 5:** 1 electron<br /><br />Therefore, a Bohr model of Rubidium would show 5 shells or rings.<br />