The mass of the atom is concentrated in the nucleus because the mass of electrons is negligible compared with the mass of protons and neutrons in the nucleus. Binding the atom‘s nucleus although it...
The weight of the object at the south pole is greater than its weight at the equator because the Earth’s gravitational acceleration at the south pole is greater than the Earth’s gravitational acceleration at...
Some of representative elements groups are known as regular groups, Because their elements show a great regularity & graduation in their properties and that is not found in the transition elements, One of the...
Radiation pollution The radiation pollution is the increase of the amount of radiation in the environment, The sources of radiation pollution are natural sources and artificial sources, Natural sources are represented by natural radioactive...
