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प्रश्न
Define the term ‘atomic number’ of an atom.
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उत्तर
Atomic number is the number of protons in the atom of an element.
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संबंधित प्रश्न
The composition of the nuclei of two atomic species X and Y are given as under
| X | Y | |
| Protons | 6 | 6 |
| Neutrons | 6 | 8 |
Give the mass numbers of X and Y. What is the relation between the two species?
ÅIn group I of the periodic table, three elements X, Y, and Z have ionic radii 1.33 Å, 0.95 Å and 0.60 Å respectively. Giving a reason, arrange them in the order of increasing atomic number in the group.
Fill in the blank of the following statement :
The total number of protons and neutrons in the nucleus of an atom is called its _________.
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Phosphorus – \[\ce{^31_15P}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
From the symbol \[\ce{^4_2He}\] for the element helium, write down the mass number and the atomic number of the element.
Which of the following are true for an element?
- Atomic number = number of protons + number of electrons
- Mass number = number of protons + number of neutrons
- Atomic mass = number of protons = number of neutrons
- Atomic number = number of protons = number of electrons
Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number.
Give short answer:
what is the atomic mass number? mention its formula.
