In the following question a statement of assertion (A) followed by a  statement of Reason (R) is given. Choose the correct option out of the choices given below in each question.
Assertion (A) Generally, ionisation enthalpy increases from left to right in a period.
Reason (R) wehn quantum level, the shielding effect fo inner core of electrons does not increase very much to compensate for the increased attraction  of the electron to the nucleus.
(a) Assertion is correct statement and reason is wrong statement.
(b) assertion and reason both are correct statements and reason is correct explanation of assertion.
 (c) Assertion and reason both are wrong statements.
(d) Assertion is wrong statement and reason is correct statement.


 (b). Assertion and reason both are correct statements and reason is the correct explanation of assertion ionisation enthalpy increases along a period because effective nuclear charge increases and atomic size decreases.

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 (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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