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Modern Periodic Law and Periodic Table

Classification of Elements and Periodicity in Properties
Chemistry
Class 11

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In the electronic configuration, outermost orbit number is considered as its period number.

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Comprehension given below is followed by some multiple choice questions. Each question has one correct option. Choose the correct option. 
In the modern periodic table, elements are arranged in order of increasing atomic number which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz s, p, d and f. The modern periodic table consists of 7 periodic and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Aufbau principle filling of a new energy shell. In accordance with the Aufbau principle, the seven period (1 to 7) have 2,8,8,18,18,32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f - block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.
Which of the elements whose atomic numbers are given below, cannot be accommodated in the present set up of the long form of the periodic table

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What is the atomic number of another element present in the same group as the element with ?

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An element has atomic number . Which of the following statements related to this element is wrong?

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An element has atomic number 16. It will belong to which period of the periodic table?

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(a) An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the periodic table does it belong?
(b) The element X forms a compound . Suggest an element that Y might be and give reasons for your choice.    

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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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Statement I : Sulfur chemically resembles oxygen.
Statement II : They are in the same period.

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There is a recurrence of properties after 2, 8, 8, and 32 elements in the periodic table. The value of is:

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If an element belongs to Period and Group II then it will have :

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