What breakthrough did Mendeleev make in devising a periodic table that was accepted by the scientific community?He devised the ‘law of octaves’He published the first full list of all the elementsHe left gaps in the table for unknown elementsHe arranged the elements in order of atomic weight2Which of the following statements about the modern periodic table is not true?Elements in the same group have the same number of electrons in the outer shellElements are arranged in atomic number orderThe number of shells decreases down a groupElements in the same period have the same number of shells3Where are the non-metal elements found in the periodic table?At the bottomAt the topOn the rightOn the left4Which of the following elements, shown by its electronic structure, is found in group 2 of the periodic table?2, 72, 8, 12, 8, 22, 8, 45Why do fluorine, chlorine and iodine all have similar chemical properties?They are all metalsThey all have 7 electrons in their outer shellThey are all in the same periodThey all have odd numbers of electrons
Question
What breakthrough did Mendeleev make in devising a periodic table that was accepted by the scientific community?He devised the ‘law of octaves’He published the first full list of all the elementsHe left gaps in the table for unknown elementsHe arranged the elements in order of atomic weight2Which of the following statements about the modern periodic table is not true?Elements in the same group have the same number of electrons in the outer shellElements are arranged in atomic number orderThe number of shells decreases down a groupElements in the same period have the same number of shells3Where are the non-metal elements found in the periodic table?At the bottomAt the topOn the rightOn the left4Which of the following elements, shown by its electronic structure, is found in group 2 of the periodic table?2, 72, 8, 12, 8, 22, 8, 45Why do fluorine, chlorine and iodine all have similar chemical properties?They are all metalsThey all have 7 electrons in their outer shellThey are all in the same periodThey all have odd numbers of electrons
Solution
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Mendeleev made several breakthroughs in devising a periodic table that was accepted by the scientific community. He did not devise the 'law of octaves', but he did publish the first full list of all the elements. He also left gaps in the table for unknown elements, predicting their properties based on the patterns he observed. Additionally, he arranged the elements in order of atomic weight.
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The statement about the modern periodic table that is not true is "The number of shells decreases down a group". In fact, the number of shells increases down a group.
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The non-metal elements are found on the right of the periodic table.
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The element with the electronic structure 2, 8, 2 is found in group 2 of the periodic table.
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Fluorine, chlorine, and iodine all have similar chemical properties because they all have 7 electrons in their outer shell.
Similar Questions
Describe how Mendeleev convinced the scientific community that his way of organising the elements into a periodic table was correct.
How many elements were uncovered during the discovery of Mendeleev’s periodic table?
Explain why Mendeleev modified earlier versions of the periodic table.
Why did Mendeleev leave gaps in his version of the periodic table?
Which of the following element was discovered after the discovery of Mendeleev’s periodic table?
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