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Why was it challenging to place isotopes in Mendeleev's periodic table?
Why was it challenging to place isotopes in Mendeleev's periodic table?
- Isotopes have different chemical properties but the same atomic masses.
- Isotopes have both different atomic masses and different chemical properties.
- Isotopes have different atomic masses but the same chemical properties. (correct)
- Isotopes have a different number of protons and electrons.
Why was it difficult to predict the number of elements that could be discovered between two heavy elements?
Why was it difficult to predict the number of elements that could be discovered between two heavy elements?
- The rise in atomic mass was uniform when elements were arranged in order of increasing atomic masses.
- There was no relation between atomic mass and element discovery.
- The rise in atomic mass was not uniform when elements were arranged in order of increasing atomic masses. (correct)
- Mendeleev's periodic table did not account for heavy elements.
What similarity does hydrogen share with halogens according to the text?
What similarity does hydrogen share with halogens according to the text?
- Hydrogen has the same atomic mass as halogens.
- Hydrogen forms similar compounds with halogens as with alkali metals. (correct)
- The molecular formulae of hydrogen compounds are different from those of halogens.
- Hydrogen has different chemical properties compared to halogens.
Based on the text, why is it challenging to determine the correct position of hydrogen in the periodic table?
Based on the text, why is it challenging to determine the correct position of hydrogen in the periodic table?
What made placing isotopes a challenge in Mendeleev's periodic table?
What made placing isotopes a challenge in Mendeleev's periodic table?
Why was predicting the number of elements between heavy elements difficult?
Why was predicting the number of elements between heavy elements difficult?
What similarity does hydrogen exhibit with alkali metals?
What similarity does hydrogen exhibit with alkali metals?
Why is determining the correct position of hydrogen challenging?
Why is determining the correct position of hydrogen challenging?
'Use your brain power!' is a phrase used in the text to emphasize what concept?
'Use your brain power!' is a phrase used in the text to emphasize what concept?
What makes predicting the number of elements between heavy elements challenging according to the text?
What makes predicting the number of elements between heavy elements challenging according to the text?
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