I got the answer 26
I’m confused what the star after the 3 is
hoped this helped:)
Rubidium is an element that belongs to Group 1. As such it will have physical properties similar to the other Group 1 elements. Rubidium is below
Potassium in the periodic table but above
Cesium. As such it would be most like one of those two elements.
The atomic number of an element identifies the number of protons and electrons.
Most scientific questions are developed from Observations.