| 1 |
An element with fifteen protons in its atomic nucleus has atomic numebr. |
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| 2 |
The central part of an atom is called. |
- A. Electron
- B. Proton
- C. Neutron
- D. Nucleus
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| 3 |
The elements of group 18 are called. |
- A. Alkali metals
- B. Noble gases
- C. Alkaline metals
- D. Transition metals
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| 4 |
The mass of an atom is almost due to the. |
- A. Electron
- B. Proton
- C. Nucleus
- D. Neutrons
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| 5 |
The particle of an atom having negative charge on it. |
- A. Electron
- B. Proton
- C. Neutron
- D. Nucleus
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| 6 |
The total numebr of electrons which M shell can accommodate |
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| 7 |
--------------- are fundamental particles of an atom. |
- A. Electron
- B. Proton
- C. Neutron
- D. All of these
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| 8 |
The numebr of electorns present in an atom s equal to number of. |
- A. Nucleus
- B. Neutrons
- C. Proton
- D. Atom
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| 9 |
In .... elements are arranged in order of increasing atomic numbers. |
- A. Group
- B. Period
- C. Orbit
- D. Shell
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| 10 |
The negetively charged particle arod nucleus are called. |
- A. Electron
- B. Proton
- C. Atom
- D. Neutron
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