What are columns of the periodic table called?

Research the neutrino using the internet and report your findings. in a nuclear decay, the nucleus of an atom splits apart. larger particles can be detected and their masses and velocities can be recorded. explain how the existence and properties of the neutrino could be predicted using the conservation laws.

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery

Hi , i am new here can anyone me out with this question why is space black after having so many shining objects like sun , moon , stars