Cesium-137 has a half-life of 30.3 years. If you start with 60g, how much cesium would be left over 90.9 years?

What is the mass of 8 moles of sodium atoms

Write the formula for the following chemicals. 7. e. trinitrogen tetraoxide a calcium phosphate f. magnesium acetate b. potassium sulfide g nickel(iii) cyanide c carbon dioxide h. silver sulfate d. cobalt(ii) chloride

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?