10th Science 1 | Chapter 2 | Periodic Classification of Elements | Lecture 1 | Maharashtra Board |

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खरच सर फ्री मध्ये तुम्ही आम्हाला इतके छान शिकवतात त्याबद्दल धन्यवाद sir 👌👌👌👍🙏

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[Sahil]

H.W.
Mg (24.3), Ca (40.1), Sr (87.6) and S (32.1), Se (79.0), Te (127.6)
according to Dobereiner's triads,
a+c

2
therefore,
a=Mg and c=Sr
24.3+87.6

2
=55.95
is not an Dobereiner's triads
a=S and c=Te
32.1+127.6

2
=79.85
is not an Dobereiner's triads
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[ShreyaMudashi]

00:04 Introduction to the second chapter of Science 1
01:34 Elements are the building blocks of everything in the universe.
05:00 Understanding the properties and classification of elements
06:35 Elements classified based on properties
09:56 Atomic mass and periodic classification overview
11:40 Arrangement of elements based on atomic mass.
14:56 Atomic mass of elements as per the Dobereiner's theory
16:30 Dobereiner's triade success depends on testing different elements
19:36 Newland's periodic table brain and homework assignment

[Sarthakkailaspawar]

Sir both H.W. is not doberiener triads...
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[samiksha]

H.W answers
1) mean calculated by dobereiner's method - 55.9
Middle element (Ca)- 40.1
Doesn't match ❌
2) mean - 79.8
Middle element (Se) - 79.0
Doesn't match ❌

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[vishalpardeshi]

Be= 9.0, Ca= 40.1, acc to dobereiners method
a+c /2
9.0+40.1/2
= 24.55
Hence, it is not a Dobereiners triads