What did Döbereiner’s work contribute to modern chemistry?

The idea that elements have recurring properties

Why was Döbereiner’s Triads not widely accepted?

It only applied to a few elements

What did Döbereiner’s Triads help scientists understand?

Elements could be grouped based on similar properties

What was Döbereiner’s main idea behind the Triads?

The properties of the middle element are an average of the other two

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Döbereiner’s Triads

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Answers

1
What property did Döbereiner notice followed a pattern in his triads?
Atomic mass
Number of neutrons
Atomic number
Boiling point
2
What did Döbereiner’s work contribute to modern chemistry?
The concept of atomic numbers
The idea that elements have recurring properties
The discovery of electron shells
The theory of relativity
3
Why was Döbereiner’s Triads not widely accepted?
It was based on atomic numbers
It only applied to a few elements
It explained all elements perfectly
It worked only for noble gases
4
Who proposed the concept of Triads in the early periodic classification?
John Newlands
Henry Moseley
Dmitri Mendeleev
Johann Döbereiner
5
Which scientist later improved Döbereiner’s periodic classification?
Henry Moseley
Dmitri Mendeleev
Albert Einstein
Niels Bohr
6
What did Döbereiner’s Triads help scientists understand?
The periodic table should be based on letters
All elements had the same atomic mass
Elements could be grouped based on similar properties
Elements had unique properties unrelated to others
7
Which of the following is NOT a Döbereiner’s Triad?
Calcium, Strontium, Barium
Sulfur, Selenium, Tellurium
Chlorine, Bromine, Iodine
Carbon, Nitrogen, Oxygen
8
What was Döbereiner’s main idea behind the Triads?
The properties of the middle element are an average of the other two
Elements should be arranged by atomic number
Every eighth element has similar properties
Elements should be arranged alphabetically
9
Which of the following is an example of Döbereiner’s Triad?
Lithium, Sodium, Potassium
Oxygen, Sulfur, Selenium
Gold, Silver, Copper
Hydrogen, Helium, Neon
10
Which of these elements belongs to the same triad as Chlorine and Iodine?
Fluorine
Argon
Neon
Bromine

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