What breakthrough did Mendeleev make in devising a periodic table that was accepted by the scientific community?He arranged the elements in order of atomic weightHe left gaps in the table for unknown elementsHe devised the ‘law of octaves’He published the first full list of all the elements2Which of the following statements about the modern periodic table is not true?The number of shells decreases down a groupElements in the same group have the same number of electrons in the outer shellElements are arranged in atomic number orderElements in the same period have the same number of shells3Where are the non-metal elements found in the periodic table?On the rightAt the topAt the bottomOn the left4Which of the following elements, shown by its electronic structure, is found in group 2 of the periodic table?2, 8, 22, 72, 8, 12, 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 arranged the elements in order of atomic weightHe left gaps in the table for unknown elementsHe devised the ‘law of octaves’He published the first full list of all the elements2Which of the following statements about the modern periodic table is not true?The number of shells decreases down a groupElements in the same group have the same number of electrons in the outer shellElements are arranged in atomic number orderElements in the same period have the same number of shells3Where are the non-metal elements found in the periodic table?On the rightAt the topAt the bottomOn the left4Which of the following elements, shown by its electronic structure, is found in group 2 of the periodic table?2, 8, 22, 72, 8, 12, 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
-
Mendeleev made several breakthroughs in devising a periodic table that was accepted by the scientific community. He arranged the elements in order of atomic weight, left gaps in the table for unknown elements, and published the first full list of all the elements. However, the 'law of octaves' was not devised by Mendeleev, but by Newlands.
-
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.
-
The non-metal elements are found on the right of the periodic table.
-
The element with the electronic structure 2, 8, 2 is found in group 2 of the periodic table.
-
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.
Which of the following element was discovered after the discovery of Mendeleev’s periodic table?
Why did Mendeleev leave gaps in his version of the periodic table?
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.