There are 8.6 x 1025 atoms in a block of Tin (Sn). How many moles is the block of Tin?

What does earth’s rotation on its axis cause? the tides night and day passing of years phases of the moon

Can someone me with 3 and 4 plz. this is for masteries test.

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.