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Standard XI
Chemistry
Modern Periodic Law and Periodic Table
Question

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

A
$$118$$
B
$$107$$
C
$$126$$
D
$$102$$
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Solution
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Correct option is C. $$126$$
In the present set up of a long-form of periodic table elements with the atomic number, $$> 118$$ can not be accommodated.

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Similar Questions
Q1
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.
The elements with atomic number 57 belongs to :
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Q2
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 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 at the bottom of the main body of the periodic table.
The elements with atomic number $$35,53$$ and $$85$$ are all ________.
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Q3

(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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Q4
In the modern periodic table, the elements are placed in order of increasing atomic number. The long form of periodic table shows all the elements in numerical order. The start of a new period always corresponds to the introduction if the first electron into the $$s-$$ orbital of a new principal quantum number. The number of elements in each period corresponds to the number of electrons required to fill the orbitals according to Aufbau principle.
$$1s, 2s 2p, 3s 3p, 4s 3d 4p, 5s 4d 5p, 6s 4f 5d 6p, 7s 5f 6s 7p$$
The main groups correspond to elements in which $$s$$ and $$p$$ orbitals are being filled. The transition elements are those in which $$d-$$ orbitals are being filled. Each group contains elements of similar electronic configuration. According to the recommendation of $$IUPAC$$, the group of elements are numbered from $$1$$ to $$18$$. The elements corresponding to filling of $$4f-$$ orbitals are called lanthanoids and those corresponding to the filling of $$5f-$$ orbitals are called actinoids. These elements are accommodated into two separate horizontal rows below the table.

There are only $$81$$ table elements known. Form these elements one or more isotopes do not undergo spontaneous radioactive decay. No stable isotope exists for any elements above bismuth. Two elements, uranium and thorium for which only radioactive isotopes exist, are found quite abundantly on earth because the half-lives of some of their isotopes are almost as great as the age of the earth.

____ periods and ____ groups are there in the long form of the periodic table.
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