In the tetrahedral shaped molecule of CBrF3 the number of lone pairs around the central atoms is ...

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 following units is not an official si unit? mole liter kilogram ampere

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit