NCERT Solution for Class 10 Science Chapter 5
Periodic Classification of Elements
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-91
Questions No-3
(a) two shells, both of which are completely filled with electrons?
(b) the electronic configuration 2, 8, 2?
(d) a total of two shells, with three electrons in its valence shell?
(d) a total of two shells, with three electrons in its valence shell?
(e) twice as many electrons in its second shell as in its first shell?
(a) Neon has two shells, both of which are completely filled with electrons (2 electrons in
K shell and 8 electrons in L shell).
(b) Magnesium has the electronic configuration 2, 8, 2.
(c) Silicon has a total of three shells, with four electrons in its valence shell (2 electrons
in K shell, 8 electrons in L shell and 4 electrons in M shell).
(d) Boron has a total of two shells, with three electrons in its valence shell (2 electrons in
K shell and 3 electrons in L shell).
(e) Carbon has twice as many electrons in its second shell as in its first shell (2 electrons
in K shell and 4 electrons in L shell).
For more answers visit to website:
https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-5/
(a) Neon (2, 8)
(b) Magnesium
(c) Silicon (2, 8, 4)
(d) Boron (2, 3)
(e) Carbon (2, 4)
(a) Ne (Neon)
(b) Mg (Magnesium)
(c) Si (Silicon) (14): 2, 8, 4
(d) B (Boron) (5): 2, 3
(e) C (Carbon) (6): 2, 4