actinium-226 has a half-life of 29 hours if 100 mg of actinium-226 disintegrates over a period of 58 hours how many mg of actinium-226 will remain?

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Main expenses you plan on making payments on a new car too. you want to spend 15% of your monthly net pay on the car payment, insurance, registration, and taxes combined. what is your monthly car allowance? $149.46 $298.91 $448.37 $597.83