| 1 |
The atomic radil of the elements in periodic table:<br> |
- A. increase form left to right in period<br>
- B. increase form top to bottom<br>
- C. do not change form left to right in period<br>
- D. decrease form top to bottom in a group<br>
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| 2 |
The no.of elements in the first period is |
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| 3 |
An ________________ scientist arranged the elements in order in periodic table. |
- A. English
- B. Italian
- C. African
- D. Indian
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| 4 |
In period, ionization energy of elements |
- A. Increases
- B. Decreases
- C. Remains constant
- D. None of these
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| 5 |
The no. of periods in modern periodic table are |
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| 6 |
The vertical columns in the periodic table are called:<br> |
- A. perlods<br>
- B. groups <br>
- C. rows <br>
- D. blocks<br>
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| 7 |
The 2nd and third periods are called |
- A. short period
- B. Normal period
- C. Long period
- D. Very long period
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| 8 |
Th name of chemist who arranged all the elements in the periodic tale is : |
- A. J.Newlands
- B. Columb
- C. Einstine
- D. None of these
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| 9 |
Group runs from ________________ |
- A. Top to bottom
- B. Left to right
- C. Top to right
- D. Bottom to left
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| 10 |
N consist of ________________ sub shells. |
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