Đọc tên các chất sau theo tên IUPAC: a) CH3- CH(CH3)-CH(CH3)-CH2 - CH3
b) CH3-CH(CH3)-CH(C2H5)-CH2 CH3

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?

Which is the solubility product expression for caf2(s)?  [ca2+]/[f–]2  [ca2+][f2–]  [ca]+[f]2  [ca2+][f–]2

Describe the forces both attractive and repulsive that occur as two atoms move closer together.