Question 2 2 points)
Which of the atoms shown has an atomic number of 42
1
2
4
7

A__ is two or more substances that are together in the same place but are not chemically combined

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?