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प्रश्न
Dalton said that ______ could not be divided.
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उत्तर
Dalton said that atoms could not be divided.
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संबंधित प्रश्न
Which of the following are isoelectronic species i.e., those having the same number of electrons?
Na+, K+, Mg2+, Ca2+, S2–, Ar
Multiple Choice Questions
If the atomic number of an atom is 17 and mass number is 35 then number of neutron will be
An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom?
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
Elements X, Y, Z have atomic numbers 6, 9 and 12 respectively. Which one:
- forms anion – negative ion;
- forms cation – positive ion;
- has 4 electrons in the outermost orbit. [Y, Z, X]
Differentiate mass number from atomic number.
Complete the following table.
| Atomic Number | Mass Number | Number of Neutrons | Number of Protons | Number of Electrons | Name of the Element |
| 9 | ______ | 10 | ______ | ______ | ______ |
| 16 | ______ | 16 | ______ | ______ | ______ |
| ______ | 24 | ______ | ______ | 12 | Magnesium |
| ______ | 2 | ______ | 1 | ______ | ______ |
| ______ | 1 | 0 | 1 | 1 | ______ |
The No. of electrons in the outermost shell of the atom of an inert gas ______.
Mass No. 27 is for the element ______.
If M is the atomic mass and A is the mass number, then packing fraction is given by ______.
