Convection
occurs in fluids
requires physical contact between molecules
occurs is solids
is the method of heat transfer used by the sun

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?

An atom with 7 protons, 6 neutrons, and 7 electrons has an atomic mass of amu. (enter a whole number.) numerical answers expected! answer for blank 1:

Select the correct location on the image identify the element that humans need to breathe. 2015 er r ights reserved