RRB NTPC Exam 2016 will test you on Atomic Structure and its components.
In this article
RRB NTPC Exam 2016 #Daily Infographic on General Science (Chemistry)
- Protons and neutrons are heavier than electrons and reside in the center of the atom, called the Nucleus
- Electrons are extremely lightweight and exist in a cloud orbiting the nucleus. The electron cloud has a radius 10,000 times greater than the nucleus.
- Protons and neutrons have approximately the same mass. However, one proton weighs more than 1,800 electrons.
- Atoms always have an equal number of protons and electrons, and the number of protons and neutrons is usually the same as well.
- Adding a proton to an atom makes a new element, while adding a neutron makes an isotope, or heavier version, of that atom.
Protons are positively charged particles found within atomic nuclei. The charge on a Proton is 1.602×10−19 C , where C stands for coulomb. They were discovered by Ernest Rutherford in experiments conducted between 1911 and 1919.
Electrons have a negative charge and are electrically attracted to the positively charged protons. The charge on an electron is 1.602 10-19 C, where C stands for Coulomb. Electrons surround the atomic nucleus in pathways called orbitals. They were discovered by J.J. Thomson.
Neutrons are uncharged particles found within atomic nuclei. A neutron’s mass is slightly larger than that of a proton. Like protons, neutrons are also made of quarks — one “up” quark and two “down” quarks. Neutrons were discovered by James Chadwick.
TAKE QUIZ ON ATOMIC STRUCTURE