Which question must be answered to complete the table below?

what kind of shielding will block beta decay?
what is the penetrating power of beta decay?
what kind of particles are produced by beta decay?
how massive are the particles in beta decay?

In order to complete the table, we must know what kind of particles are produced by beta decay.
The first row of the table contains the type of particles that are emitted in each type of radioactive decay. The second row contains the charge that is present on the emitted particle. The final row contains information on the penetrative power of each of the particles.

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.

If its history of, then b) because a) implies only present day (now)