Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Match the elements in Column I with their correct electron distribution in Column II according to the BohrтАУBury rules:
Column I: A. Potassium (K), B. Neon (Ne), C. Chlorine (Cl) Column II: 1. 2, 8, 7; 2. 2, 8, 8, 1; 3. 2, 8
A-2, B-3, C-1
A-1, B-2, C-3
A-3, B-1, C-2
A-2, B-1, C-3
2, B-3, C-1
The electronic configuration of an atom is determined by the Bohr-Bury scheme, which dictates the distribution of electrons in different shells. Elements are filled based on their atomic number, with the maximum capacity of any shell n defined by the formula 2n2.
The electronic configuration of an atom is determined by the Bohr-Bury scheme, which dictates the distribution of electrons in different shells. Elements are filled based on their atomic number, with the maximum capacity of any shell n defined by the formula 2n2.
Think of electronic shells like a multi-story hotel where each floor has a strict occupancy limit; you must fill the first floor completely before moving to the next.
KLMN shells follow the 2n2 rule (Keep Looking Mainly Now).
2n2 тАФ The formula to calculate the maximum number of electrons in a shell, where n is the shell number.
Electrons fill shells in increasing order of energy, starting from the innermost shell (K-shell). According to 2n2, the K-shell holds 2(1)2=2, L-shell holds 2(2)2=8, and M-shell holds 2(3)2=18 electrons. For Potassium (Z=19), the configuration is 2,8,8,1. For Neon (Z=10), it is 2,8. For Chlorine (Z=17), it is 2,8,7.
The maximum number of electrons that can be accommodated in the outermost shell is 8.
Electrons are not accommodated in a given shell unless the inner shells are filled.
Potassium (K) has 19 electrons: 2+8+8+1=19.
Neon (Ne) is a noble gas with 10 electrons: 2+8=10.
Chlorine (Cl) is a halogen with 17 electrons: 2+8+7=17.
Predicts the valency of elements.
Explains the chemical reactivity and periodic trends.
Does not account for subshells (s, p, d, f) or spin quantum numbers.
Fails to explain the fine structure of atomic spectra.
Determination of valency for chemical bonding.
Understanding the periodic table grouping of elements.
Atomic numbers: Potassium (Z=19), Neon (Z=10), Chlorine (Z=17).
Option D is incorrect because it mismatches Chlorine and Neon configurations.
A is correct тАФ Potassium matches 2, 8, 8, 1; Neon matches 2, 8; and Chlorine matches 2, 8, 7.
Remember that the last shell cannot hold more than 8 electrons; this is the Octet Rule, which is vital for understanding why atoms form chemical bonds.
Get instant step-by-step AI explanations, full shift Previous Year Papers (SSC GD, RRB, SSC JE), and regional rank analysis on the official Examoogle App.
Free Download тАв 100K+ Aspirants