15 which of the following statements does not describe the structure of an atom?
a)the electron cloud is a small and compacted space around the nucleus.
b)inside the nucleus of an atom are protons and neutrons.
c) protons are positively charged sub-atomic particles.
d)electrons are negatively charged sub-atomic particles

The answer would be A because inside of an atom is protons and neutrons. Protons are + neutrons are neutral and electrons are -. The electron cloud is big not small.

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.

Ithink the answers is b i hope it my friend message me if i’m wrong and i’ll change my answer and fix it for you