How many moles of atoms are there in 27g of aluminium

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block