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The elements ...

Question

The elements A, B, C and D have atomic numbers 4, 12, 17 and 19 respectively. Which of the following pair of elements belong to the same period?

A

B and C

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B

A and B

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C

C and D

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D

A and D

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Solution

The correct option is A B and C
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Q. Question 7
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?

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Q. The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belongs to the same group?

Q. The elements A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is:

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a) Which pair of elements belongs to same group?
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