Francium is a naturally occurring radioactive element. at any moment there is probably no more than an ounce of francium on earth. francium's chemical properties are most similar to those of which of the following elements? uranium radium rubidium barium

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.

Pls why does copper oxide appear on a penny faster when a penny is heated in a flame than when the penny is at room temperature explain