Question

शैक्षणिक सत्र 2020-21 माह अक्टूबर
असाइनमेंट-2
दसवीं
विषय विज्ञान
दूर्णांक-20
निर्देश दिए गए अभ्यास प्रश्नों को निर्देशानुसार हल कीलिए -
Instruction:- Please attempt the questions as per given instructions.
प्रश्न 1 मेण्डलीफ की आवर्त सारणी एवं मोसले की आधुनिक आवर्त सारणी में तत्वों
की व्यवस्था की तुलना कीजिए। (कोई पाँच)
अंक, 1/5 शब्दसीमा 100-150
Q.1 Compare and contrast the arrangements of elements in
Mendleev's periodic table and Mosley's modern periodic
table. (any five)​

Answer 1

Answer:

Elements were arranged in increasing order of atomic masses. 1. Elements are arranged in increasing order of atomic numbers.

2. There are 8 groups. 2. There are 18 groups.

3. Each group is divided into subgroups a and b. 3. Groups are not divided into subgroups.

4. The group for noble gases was not present, as noble gases were not discovered at that time. 4. A separate group, i.e. group 18 is present for noble gases.

5. There was no place for isotopes. 5. This problem was rectified, as slots are determined on the basis of atomic number...

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