450 min/1 day, convert to seconds. year, use dimensional analysis.

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change