What would be the ratio of product of speed and time period of electron orbiting 3rd and 4th stable orbit in bohr’s atomic model?.

Which part of a feedback mechanism is able to monitor the conditions outside of cells and usually uses nerve cells to relay this information to an intergrating center

Based on its chemical properties, identify the position of each chemical family on the periodic table.

How many protons, electrons, and neutrons are in each of the following isotopes? a. zirconium-90 b. palladium-108 c. bromine-81 d. antimony-123