What are the properties of covalent compound

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 of the dna typing techniques do you think you would choose if you had to analyze a dna sample? why?

Match the mixture with the substance// i really need on this guys (it’s a pic btw)