Calculate the electronegativity difference of the elements in H20. Show your work.

Si una estrella no tiene paralaje medible, ¿qué puedes inferir?

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

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?