CBSE Guess > Papers > Important Questions > Class IX > 2009 > Science > Science By : Mr M. p. Keshri
CBSE CLASS I X
Structure Of The Atoms (Solved)
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Q. 78. How are the electrons arranged outside the nucleus ?
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Q. 79. State the meaning of electronic configuration of elements ?
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Q. 80. Both the K and L-shells of an atom are full. Give the total number of electrons in the atom.
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Q. 81. Can electrons be arranged in L-shell without filling K-shell.
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Q. 82. Fluorine atom has 9 electrons and 9 protons. State the number of energy shells in its atom.
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Q. 83. Magnesium atoms has 12 electrons. Which shell is incomplete ?
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Q. 84. Argon atoms has 18 electrons. State which energy shell is incomplete ? How many energy shells does the atom contain. ?
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Q. 85. State the similarities in the electronic configuration of the following sets of elements. Atomic number of each element is given in the brackets :
lithium (3), sodium (11) and potassium (19); helium (2), neon (10) and argon (18); beryllium (4), magnesium (12) and calcium (20).
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Q. 86. Give the static models of aluminium (atomic no.=13)and sulphur (atomic no.= 16)displaying their electronic configurations.
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Q. 87. The atom of an element does not take part in chemical combination. What is the number of electrons in the outermost shell of this atom ?
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Q. 88. Write the distribution of electrons in carbon and sodium atoms.
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Q. 89. If K and L shells of an atom are full then what would be the total number of electrons in the atom ?
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