Weathering is . a.
caused by the movement of materials over rocks
b.
not a natural process
c.
a process whereby rocks are broken down by direct contact with the atmosphere
d.
all of the above

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

The element that has the greatest electronegativity is

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)