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 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 actinoids are placed at the bottom of the
main body of the periodic table.
(i) 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) 7s² 7p⁶ (b) 5f¹⁴ 6d¹⁰ 7s² 7p⁰
(c) 4f¹⁴ 5d¹⁰ 6s² 6p⁶ (d) 4f¹⁴ 5d¹⁰ 6s² 6p⁴
(iii) 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) 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) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d5 4s²
(b) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d5 4s³ 4p⁶
(c) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d 6 4s²
(d) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d7 4s²
(v) The elements with atomic numbers 35, 53 and 85 are
all ................ .
(a) noble gases (b) halogens
(c) heavy metals (d) light metals

Answer 1

Answer:

noble gases...

Explanation:

hope it's help u...

Answer 2

●(i) The element with atomic number 57 belongs to

(c) d-block

●After this element starts the lanthanoids series

●(ii) The last element of the p-block in 6th period is

represented by the outermost electronic configuration.

(c) 4f¹⁴ 5d¹⁰ 6s² 6p⁶

●It is Rn (Radon) 86

(iii)(c) 126

●No space in periodic table

●(iv) The electronic configuration of the element which is

just above the element with atomic number 43 in the

same group is-

(a) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d5 4s2

●This configuration is of Mn manganese 25 - 7th group.

●(v) The elements with atomic numbers 35, 53 and 85 are

all -

●(b) halogens