Represente novamente as seguintes estruturas, completando com o número adequado de hidrogênio ​

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

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?

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver