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प्रश्न
Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number.
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उत्तर
11Na -2,8,1 (11 electrons)
Na – 1e–—> Na+ (10 electrons) Electronic configuration 2, 8.
The atomic number of an element is equal to the number of protons in its atom. Since, sodium atom and sodium ion contain the same number of protons, therefore, the atomic number of both is 11.
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संबंधित प्रश्न
Multiple Choice Questions
The sum of number of protons and number of neutrons present in the nucleus of an atom is called its
WRITE SHORT ANSWER
Define the atomic mass number of an atom.
An atom of an element has two electrons in the M shell.
What is the (a) atomic number (b) number of protons in this element?
Give reason
Actual atomic mass is greater than mass number.
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
Do isotopes have the same atomic number or the same mass number?
Define the term of atomic number.
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]
Atomic number : ______ :: Mass number : Number of protons and neutrons.
Compare the charge and mass of protons and electrons.
An element has 2 electrons in its N shell.
What is its atomic number?
