What type of coverage is required for protection against radioactive substances?

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?

Find the mass, in grams, of 5.00*10^23 molecules of f2

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa