RRB NTPC Exam 2016: Science Made Simple (Inf.6) Atomic Structure

RRB NTPC Exam 2016 will test you on Atomic Structure and its components.

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.

• 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

  span style="color: #000000;">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

Start Quiz!

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1. Proton was discovered because of experiments conducted by _________.

 Goldstein

 Rutherford

 Chadwick

 Thomson

Question 1 of 5

2. Almost the entire mass of an atom is concentrated in the__________.

 Protons

 Neutrons

 Nucleus

 Electrons

Question 2 of 5

3. The absolute charge of an electron is___________.

 16 x 10-19C

  1.6 x 10-19C

  + 1.6 x 10-19C

 – 1.6 x 10-19C

Question 3 of 5

4. The proton is heavier than an electron by_________.

 1836 times

 1936 times

 1736 times

 1000 times

Question 4 of 5

5. Chadwick got the Nobel Prize for the discovery of __________.

 Neutron

 Proton

 Electron

 Nucleus

Question 5 of 5

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HELPFUL LINKS

How to Prepare General Science Section for RRB NTPC Exam

References: www.livescience.com