NCERT Based Test: Electronic Configurations & Types of Elements; s, p, d & f-Blocks - NEET MCQ

(A) Z = 62; 4f⁶ 5d° 6s² (f-block)
(B) Z = 47; 4d¹⁰ 5s¹ (d-block)
(C) Z=56; 6s² (s-block)
(D) Z = 53 ; 5s² 5p⁵ (p-block)

Z = 3; 1s² 2s¹ ; Z = 20; 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

Element with atomic number 30 ; [Ar] 3d¹⁰ 4s²
Element with atomic number 48 ; [Kr] 4d¹⁰ 5s²
Element with atomic number 80; [Xe] 4f¹⁴5d¹⁰6s²

n = 4 hence, element lies in 4^th period.
Group number = ns + (n - 1)d = 2 + 8 =10

There are 18 groups and 7 periods in periodic table. All members of 18^th group are noble gases and first group contains alkali metals which are the most electropositive.

Barium belongs to s-block with an outer configuration 6s².

Since n = 2 it belongs to 2^nd period.

ns² np² are members of carbon family.
Chalcogens is the general name of 16^th group elements.

It belongs to p-block while other elements belong to d-block and same group.

For f-orbital, l = 3, m_l= 2l + 1 = 7
There are 7 electrons with +1/2 spin and 7 electrons with -1/2 spin. Hence, total electrons are 14.

Metalloids are shown by the zig-zag boxes and the elements preseht on the right side of the boundary are non-metals. Metals are present on the left side of the periodic table.

(i) is an alkali metal. It readily loses an electron to attain a noble gas configuration.
(iii) is a noble gas. It has completed its octet.
Highly electropositive (i) and highly electronegative (ii) form ionic compounds.
(iv) has high ionization enthalpy as removal of an electron will break half-filled 2p subshell.

In the periodic classification of elements: The properties of elements are the periodic functions of their atomic number. Non-metallic elements are less in number than metallic elements. For transition elements, the last electron enters into (n - 1) d-subshell.

There are three transition series,each containing 10 elements.The fourth has incomplete position hence discussed with f-Block elements

It contains maximum number of electrons in the outermost shell. An element with more than 3 electrons in outermost shell is non-metallic.