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Groups in Modern Periodic Table

The elements ...

Question

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?

(a) A and B
(b) B and D
(c) A and C
(d) D and E

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Solution

Option (c) is correct.
Elements A and C have electrons in their valence shell. All the elements which belong to the same group should have the same number of valence electrons.

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Similar questions

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:

(a) A and B
(b) B and D
(c) A and C
(d) D and E

Q. The elements

A, B, C, D a n d E

have atomic number 9, 11,17,12 and 13, respectively. Which pair of elements belongs to the same group?

Q. Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are:

(a) A, B, C
(b) B, C, D
(c) A, D, E
(d) B, D, E

Q. Question 6
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?

(a) A, B, C
(b) B, C, D
(c) A, D, E
d) B, D, E

The elements and their atomic numbers are given:

A = 6
B = 24
C = 32
D = 49
Which of the elements belong to same group?

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Groups in Modern Periodic Table

Standard X Chemistry

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