Question
Download Solution PDFIf the first and third members of a Doberiner triad are Phosphorus and Antimony, the second member of this triad is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- Doberiner made groups of three elements each having similar chemical properties and called them triads.
- Doberiner arranged the 3 elements in a triad in an increasing order of atomic mass and showed that the atomic mass of the middle element was equal to the mean of the atomic masses of the two elements.
|
Triad |
Element – 1 |
Element – 2 |
Element – 3 |
|
Actual atomic mass(a) |
Mean = (a + c)/2 |
Actual atomic mass (c) |
|
|
Li, Na, K |
Lithium (Li) |
Sodium (Na) |
Potassium (K) |
|
6.9 |
(6.9 + 39.1)/2 = 23.0 |
39.1 |
|
|
P, As, Sb |
Phosphorus(P) |
Arsenic (As) |
Antimony (Sb) |
|
30.9 |
(30.9+121.7)/2 = 76.9 |
121.7 |
Last updated on Jun 11, 2025
-> The RRB NTPC Admit Card 2025 has been released on 1st June 2025 on the official website.
-> The UPSC Prelims Result 2025 and UPSC IFS Result 2025 has been released @upsc.gov.in
-> Railway Recruitment Board activated the RRB ALP application form 2025 correction link, candidates can make the correction in the application form till 31st May 2025.
-> The Railway Recruitment Board (RRB) has released the official RRB ALP Notification 2025 to fill 9,970 Assistant Loco Pilot posts.
-> The Railway Recruitment Board (RRB) has released the official RRB ALP Notification 2025 to fill 9,970 Assistant Loco Pilot posts.
-> The official RRB ALP Recruitment 2025 provides an overview of the vacancy, exam date, selection process, eligibility criteria and many more.
->The candidates must have passed 10th with ITI or Diploma to be eligible for this post.
->The RRB Assistant Loco Pilot selection process comprises CBT I, CBT II, Computer Based Aptitude Test (CBAT), Document Verification, and Medical Examination.
-> This year, lakhs of aspiring candidates will take part in the recruitment process for this opportunity in Indian Railways.
-> Serious aspirants should prepare for the exam with RRB ALP Previous Year Papers.
-> Attempt RRB ALP GK & Reasoning Free Mock Tests and RRB ALP Current Affairs Free Mock Tests here