In the modern periodic table, elements are arranged in order of increasing atomic number which is related to the electronic configuration. Depending upon the of orbitals receiving the last electron, the elements in the periodic table have been divided int (2024)

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A

$$1s^22s^22p^63s^23p^63d^54s^2$$

B

$$1s^22s^22p^63s^23p^63d^54s^24p^6$$

C

$$1s^22s^22p^63s^23p^63d^64s^2$$

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Correct option is A. $$1s^22s^22p^63s^23p^63d^54s^2$$
In the modern periodic table, elements are arranged in order of increasing atomic number which is related to the electronic configuration. Depending upon the 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 periods 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 the bottom of the main body of the periodic table..The electronic configuration of the elements which is just above the elements with atomic number 43 in the same group is ____ (1)

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1

269. In the modern periodic table, elements are arranged in order of increasing atomic numbers 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 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Aufbau principle, the seven periods (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 off-block elements, are called. lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.

The last element of the block in the 6th period is


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Q

2

(i) 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 numbers 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 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Aufbau principle, the seven periods (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 actionoids are placed at the bottom of the main body of hte periodic table
The element with atomic number 57 belongs to
(a) s- block ( b) p-block (c) d- block (d) f- block

(ii) The last element of the p - block in 6th period is represented by the outermost electronic configuration.
(a) 7s27p6 (b) 5f146d107s27p0
(c) 4f145d106s26p6 (d) 4f145d106s26p4

(iii) Which of the elements whose atomic numbers are given below, cannot be accommodated in the present set up of the long frm of the periodic table?
(a) 107 (b) 118 (c) 126 (d) 102

(iv) The electronic configuration of the element which is just above the element with atomic number 43 in the same group is .....
(a) 1s22s22p63s23p63d54s2
(b) 1s22s22p63s23p63d54s34p6
(c) 1s22s22p63s23p63d64s2
(d) 1s22s22p63s23p63d74s2

(v) The elements with atomic numbers 35, 53 and 85 are all ..
(a) noble gases (b) halogens (c) heavy metals (d) light metals

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Q

3

a) Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why ? [2 Marks]

b) Compare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Periodic Table. [4 Marks]

c) Write a short note on ionisation energy. [1 Mark]

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Q

4

(a) What were the two major shortcomings of Mendeleev's periodic table? How have these been removed in the modern periodic table?
(b) Two elements X and Y have atomic numbers 12 and 16 respectively. Write the electronic configuration for these elements. To which period of the modern periodic table do these two elements belong? What type of bond will be formed between them and why?
(c) To which groups of the modern periodic table do the elements X and Y belong? Give reason for your answer.
(d) What could the elements X and Y be? Write their names and symbols.

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Q

5

Fill in the blanks with correct option.

1. Properties of element are periodic function of their _______ (atomic mass/ atomic number/ relative atomic mass).

2. The elements having same _______(electronic configuration/ number of valence electrons) are placed in the same group.

3. In the modern periodic table the elements placed below sodium are expected to have________(lower/ higher) electronegativity than sodium and the elements placed above chlorine are expected to have ______(lower/ higher) ionization energy than chlorine.


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In the modern periodic table, elements are arranged in order of increasing atomic number which is related to the electronic configuration. Depending upon the of orbitals receiving the last electron, the elements in the periodic table have been divided int (2024)

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