Atoms of AA decay to atoms of BB with a half-life of 100,000 years. If there are 1,000 atoms of AA to begin with (and O atoms of BB), how long will it take for
there to be 250 atoms of AA?*
100,000 years
200,000 years
300,000 years
400,000 years

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.

the term hydride is commonly named after binary compounds that hydrogen forms with other elements of the periodic table. hydride compounds in general form with almost any element, except a few noble gases. the trends and properties vary according to the type of intermolecular force that bonds the elements together, the temperature, its molecular masses, and other components. hydrides are classified into three major groups, depending on what elements the hydrogen bonds to. the three major groups are covalent, ionic, and metallic hydrides. formally, hydride is known as the negative ion of a hydrogen, h-, also called a hydride ion. because of this negative charge, hydrides have reducing, or basic properties. its special characteristics will be further discussed.

explanation: