Answer:
: cathode rays
a beam of electrons emitted from the cathode of a high-vacuum tube.
During the 1880s and '90s scientists searched cathode rays for the carrier of the electrical properties in matter. Their work culminated in the discovery by English physicist J.J. Thomson of the electron in 1897.
Answer:
The s-block of the periodic table has 1 orbital
we know that each orbital consists of 2 electrons
and since the periodic table arranges the elements on the basis of their atomic number,
the s-block spans 2 groups.
This is also the reason why the p-block spans 6 groups, d-block spans 10 groups and f-block spans 14 groups