is used in many home smoke alarms. If 10% of the americium in a smoke detector decays in 180 years, what is the half-life of this isotope

Imagine that you’re getting ready to move to a new city. when people move, they are influenced by push factors and pull factors, and you have many reasons for your move. which of the following factors is an example of a pull factor? a. wanting to move because you’ve found a great new school somewhere new b. needing to move because there are not enough resources in your old hometown c. being forced to move because your old home is gone d. having to move because there are no jobs in your current hometown

Compare and contrast the bohr model and the electron cloud models of the atom.

The excretory system,need answers for all: )