Why do elements in a vertical column of the periodic table have similar chemical properties?
a. they possess the same number of outermost electrons.
b. they have similar physical characteristics.
c. they are found in similar locations in nature
d. they have similar atomic masses.

If two objects at different te,peraure are in contact with each other what happens to their temperature

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium

Uranium can supply energy for the worlds electricity without admitting harmful greenhouse gases which of these statements best describes an outcome of uranium mining