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What is the maximum number of electrons which can be accommodated in an atom in which the highest principal quantum number value is 4:
(1) 10
(2) 18
(3) 32
(4) 54
Ans: 32
Isoelectronic species are: (1) K + Cl - (2) Na + Cl - (3) Na Ar (4) Na + Ar Ans: K + Cl -
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Be 2+ is isoelectronic with: (1) Mg 2+ (2) Na + (3) Li + (4) H + Ans: Li +
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Q. Show the Occurrence of Metals? Earth's crust and sea are the two main sources of metals. In the earth's crust metals occur both in the combined state in the form of minerals
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