What does an alpha particle consist of?

If a 100 g sample of an isotope with a half-life of 10 years decays for 20 years, the remaining mass will be

When an ion with a charge of + 2 gains two electrons, it no longer is an ion. True False

Which two elements have the same number of valence electrons? Na and Sr Zr and H O and S Mg and P

Is a sample of liquid nitrogen more dense than a sample of nitrogen gas

The skin and lungs get rid of this waste? What does it het rid of?

Fluorine-18, which has a half-life of 110 min, is used in PET scans. a. If 100. mg of fluorine-18 is shipped at 8:00 a. m., how many milligrams of the radioisotope are still active after 110 min? b. If 100. mg of fluorine-18 is shipped at 8:00 a. m.

The reaction of methane with water to form carbon dioxide and hydrogen is non - spontaneous at 298 k. at what temperature will this system make the transition from non-spontaneous to spontaneous? the data refer to 298 k.

The sedimentary rock formed when water deposits tiny particles of clay in very thin flat layers is called? a. gymsum b. shale c. limestone d. calcite

What change into velocity

Would you expect the h atoms to remain bonded to each other, or would the molecule fall apart?