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The atomic weight of an element is double its atomic number. If there are four electrons in 2P orbital, the element is:
(1) C
(2) N
(3) O
(4) Ca
Ans: O
A beaker of water sits in the sun until it reaches an equilibrium temperature of 30°C. The beaker is made of 100 g of aluminum and contains 170 g of water. In an attempt to cool th
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what is energy and its type?
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why an electron can''t exist in the nucleus .
Q. Give basic postulate of special theory of relativity? A plane-convex lenses L of large radius of curvature with its convexities is placed on a plane glass plate P. When ligh
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