Chemistry-Objective Related Question Answers
776. The path of the electron according to Niels Bohr’s theory was?
Orbit (Shell)
777. Electron is looked upon as a cloud of negative charge according to?
Wave - mechanics theory
778. The region of space around the nucleus where there is a high probability of finding an electron is called?
Orbital
779. Who put forward the principle of uncertainty?
Werner Heisenberg
780. What do you mean by Avagadro’s number?
Number of particles in one mole of any substance
781. The wave nature of electron was suggested by whom?
Louis De Broglie
782. The number of electrons in oxygen atom is?
8
783. Who discovered electrons?
J. J. Thomson
784. What are the neutrons and protons in an atom collectively known as?
Nucleons
785. The scientist who introduced the model of the atom similar to the solar system?
Rutherford
786. What are isotopes?
Atoms having same atomic number but different mass number. Father of Periodic Table is? DMITRI IVANOVICH MENDELEEV
787. What are isobars?
Atoms having same mass number but different atomic number
788. What are isotones?
Atoms having equal number of neutrons
789. What is the basis for modern classification of the elements?
Atomic number
790. What was the basis for Mendeleev classification of elements?
Atomic weight
791. The horizontal rows of elements in the periodic table are called?
Periods
792. Modern periodic table was developed by?
Henry Moseley
793. The vertical columns of the periodic table are called?
Groups
794. Which group contains the elements with largest atomic size?
First group
795. As the size of the atom increases the electronegativity?
Decreases
796. What kind of elements generally form coloured compounds?
Transition metals
797. Who studied the relationship between atomic volume and atomic weight?
Lothar Meyer
798. The first group elements are called?
Alkali metals
799. The outermost orbit of an atom is called?
Valence shell.
800. The electrons present in the outmost shell of an atom is called?
Valence electrons
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