PLS PLS HELP ME!! Alkali metals (Group 1 elements in the periodic table) are known to be very reactive.
Which statement accurately explains the reactivity of the alkali metals?
A
Alkali metals are very reactive because they all are solids at room temperature.
B
Alkali metals have very low density, which makes them very reactive because they want to gain energy and become stable.
C
Alkali metals are all in Group 1 of the periodic table making them very reactive because the reactivity of a metal increases from right to left across each row.

D
Alkali metals are in Group 1 of the periodic table making them less reactive because the reactivity of a metal increases from left to right across each row.

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

Multiply the 3 dimensions, assuming it is a rectangular cuboid, to get the volume in cm³ divide mass by volume to get density in g/cm³