Question

frind help me fast please​

Answer 1

Answer:

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Explanation:

Answer 2

Answer:

The key shortcomings of Dobereiner’s method of classifying elements are listed below.

• The identification of new elements made this model obsolete.
• Newly discovered elements did not fit into the triads.
• Only a total of 5 Dobereiner’s triads were identified.
• Even several known elements did not fit into any of the triads.
• Owing to these shortcomings, other methods of classifying elements were developed

Hope it helps you dear.....xd