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Standard XI
Chemistry
Modern Periodic Law and Periodic Table
Question

The atomic numbers of three elements A, B and C are given below:
Element Atomic number
A 5
B 7
C 10
(i) Which element belongs to group 18?
(ii) Which element belongs to group 15?
(iii) Which element belongs to group 13?
(iv) To which period/periods do these elements belong?

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Solution
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(i) Element C (2,8) belongs to group 18.

(ii) Element B (2,5) belongs to group 15.

(iii) Element A (2,3) belongs to group 13.

(iv) These elements belong to 2nd period (2 shells are filled) of the periodic table.

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Similar Questions
Q1
The atomic numbers of three elements A, B and C are given below:
Element Atomic number
A 5
B 7
C 10
(i) Which element belongs to group 18?
(ii) Which element belongs to group 15?
(iii) Which element belongs to group 13?
(iv) To which period/periods do these elements belong?
View Solution
Q2
The atomic numbers of three elements A, B and C are given below:
Element Atomic number
A 5
B 7
C 10

(i) Which element belongs to group 18?
(ii) Which element belongs to group 15?
(iii) Which element belongs to group 13?
(iv) To which period/periods do these elements belong?
View Solution
Q3

The atomic numbers of three elements A, B and C are given below :

Element Atomic number

A 5

B 7

C 10

(i) Which element belongs to group 18? (ii) Which element belongs to group 15?

(iii) Which element belongs to group 13? (iv) To which, period/periods do these elements belong?

View Solution
Q4
The atomic numbers of three elements A, B and C are given below:
Element Atomic number
A 5
B 7
C 10

(i) Which element belongs to group 18?
(ii) Which element belongs to group 15?
(iii) Which element belongs to group 13?
(iv) To which period/periods do these elements belong?
View Solution
Q5
Element with atomic number Z = 14 belongs to which group and period?
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