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Question
Fill in the blanks- The number of protons in the nucleus of an atom is called its ....................
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Solution
The number of protons in the nucleus of an atom is called its atomic number.
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Multiple Choice Questions
The sub atomic particle with negative charge is
Fill in the following blanks in respect of an atom of an element
| No. of protons | No. of neutron | Mass number | Atomic number | No. of electrons | Symbol |
| 11 | 12 | ___________ | ___________ | ___________ | ________ |
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
If an isotope of ‘H’ has mass no. = 3, how many neutrons does it have.
From the symbol \[\ce{^4_2He}\] for the element helium, write down the mass number and the atomic number of the element.
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]
Explain the following terms.
- Proton
- Electron
- Neutron.
The Atomic number of an element is 20. It has ______ valence electrons.
Ca2+ has completely filled outer shell. Justify your answer.
