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प्रश्न
Match the atomic numbers 4,8,10,15 and 19 with each of the following:
An element which does not form ion
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उत्तर
Atomic number 10
Electronic configuration (10): 2,8
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संबंधित प्रश्न
What is variable valency? Name two elements having variable valency and state their valencies.
Tick the most appropriate answer.
Which of these have similar chemical properties but different set of physical properties and mass number?
- isobars
- elements
- isotopes
- none of these
If an atom ‘A’ has atomic number 19 and mass number 39, state –
- Its electronic configuration.
- The number of valence electrons it possesses.
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Isotopes of hydrogen [11H, 21H, 31H]
What is mass number of an atom?
What is a neutron?
Name the 3 sub-atomic particles of an atom.
The Atomic number of an element is 20. It has ______ valence electrons.
______ = No. of protons = No. of the electrons.
Element ‘P' has electronic configuration 2,8,8,1. The number of chlorine atoms present in the chloride of ‘P’ is ______.
