How is the modern periodic table different from Dmitri Mendeleev's table?A.Elements are now organized by increasing atomic mass.B.The lanthanides and actinides are now in rows below the main table.C.Elements that have similar properties are now grouped together.D.The table is now used to predict the properties of elements.
Question
How is the modern periodic table different from Dmitri Mendeleev's table?A.Elements are now organized by increasing atomic mass.B.The lanthanides and actinides are now in rows below the main table.C.Elements that have similar properties are now grouped together.D.The table is now used to predict the properties of elements.
Solution
The modern periodic table differs from Dmitri Mendeleev's table in several ways:
A. In Mendeleev's table, elements were organized by increasing atomic mass. However, in the modern periodic table, elements are organized by increasing atomic number, which is the number of protons in an atom's nucleus.
B. The lanthanides and actinides, also known as the f-block elements, are now in rows below the main table. In Mendeleev's time, these elements had not yet been discovered.
C. In both Mendeleev's and the modern periodic table, elements with similar properties are grouped together. However, the modern table has a more accurate arrangement due to the understanding of atomic structure and electron configuration.
D. Both Mendeleev's table and the modern periodic table can be used to predict the properties of elements. However, the modern table, with its understanding of atomic structure, can do so with greater accuracy.
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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
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