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.
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Protons
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.
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Electrons
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.
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Neutrons
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
HELPFUL LINKS
How to Prepare General Science Section for RRB NTPC Exam
References: www.livescience.com
