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प्रश्न
Multiple Choice Questions
The sub atomic particle with negative charge is
विकल्प
proton
neutron
electron
nucleon
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उत्तर
electron
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संबंधित प्रश्न
What are the atomic numbers of elements whose outermost electrons is represented by 3s1.
FILL IN THE BLANK
Atomic theory of matter was given by ..........................
Fill in the blank of the following statement :
The total number of protons and neutrons in the nucleus of an atom is called its _________.
Fill in the blank of the following statement :
All the mass of an atom is concentrated in a small region of space called the ___________.
The number of electrons in the atom of an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of an atom of this element ?
Match the atomic numbers 4,8,10,15 and 19 with each of the following:
An element which does not form ion
Elements X, Y and Z have atomic numbers 6,9 and 12 respectively. Which one:
- Forms an anion
- Forms a cation
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 | ______ |
A ______ number describes a specific aspect of an electron.
If M is the atomic mass and A is the mass number, then packing fraction is given by ______.
