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Structure of Atom
Write down the electronic configuration of elements from atomic number 21 to atomic number 30. Also name the elements.
| Element | Atomic number (Z) | Electronic Configuration |
| Scandium (Sc) | 21 | [Ar]184s23d1 |
| Titanium (Ti) | 22 | [Ar]18 4s23d2 |
| Vanadium(V) | 23 | [Ar]18 4s23d3 |
| Chromium(Cr) | 24 | [Ar]18 4s23d5 |
| Manganese(Mn) | 25 | [Ar]18 4s23d5 |
| Iron (Fe) | 26 | [Ar]18 4s23d6 |
| Cobalt (Co) | 27 | [Ar]18 4s23d7 |
| Nickel (Ni) | 28 | [Ar]18 4s23d8 |
| Copper (Cu) | 29 | [Ar]18 4s13d10 |
| Zinc (Zn) | 30 | [Ar]184s23d10 |
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Name the particles which determine the mass of an element.
What are α-particles?
What are the fundamental particles present in a neutral atom having atomic number greater than 1?
Do protons and neutrons have identical mass?
When α-particles are sent through a thin metal foil, most of them go straight through the foil. What inference do you draw from it?
What did Rutherford's experiment on scattering of particles show for the first time?
What is Plum-Pudding model of the atom?
Are neutrons present in all atoms?
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