Answer:
Alkali metals are highly reactive elements that appear to be silver and they are found in group 1 of the periodic table. It consists of lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). As you go further down the group, the more reactive they are. Those elements all react to water and air, so they must be kept in oil to preserve their state.
Volume of 20 g of hydrogen at normal temperature and pressure (NTP) = 240.55 ml.
The density will become less, this is because thing with less density float to the top when things with more density float to the bottom. It also becomes colder.
Answer:
the organisms themselves,other organisms,interactions between living organisms, and even their waste.
