PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free Demo1. The atomic number of calcium and argon are \(20\) and \(18\), respectively, but the mass number of both these elements is \(40\). What is the name given to such a pair of elements?
A pair of elements with the same mass number but different atomic numbers are called .
2. Why did Rutherford select a gold foil in his α-ray scattering experiment?
Gold is a with a high mass number. A cannot be employed because the atom of a light metal will be pushed forward when hit by fast-moving alpha-particles and no scattering will occur. Further, gold is highly and can be beaten to produce extremely thin foils.
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