PLS HELP i will give 10 points In Mendeleev’s Periodic Table, why was there no mention of Noble gases like Helium, Neon and Argon?

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?

For each of the compounds below, show that the charges on the ions add up to zero. a. kbr b. cao c. li(2)o d. cacl(2) e. alcl(3)

If you try to move a piano and are unable to move it, did you perform any work in the scientific sense of the word? yes or no?