Actinct Series" 2511 (252) in ud can in 1953.John Newlands presented a paper, classifying the 56 discovered elemerts into 11 groups based on similar physical properties. He noted that pairs of similar elements existed which differed by some multiple of eight in atomic weight. In 1884 Newlands published his version d the periodic table and proposed the Law of Octives stating that any given element exhibits analogous behavior to the eighth element following it in the table. Dimitri Mendeleev noticed patterns in the properties and atomic weights of halogens, alkali metals and alkaline metals. He also observed similarities between the series Cl-K-Ca, Br. Rb-Srandi-Cc-Ba. In an effort to extend this pattern to other elements, Mendeleev created a card for each element.containing the element's symbol atomic weight, and chemical and physical properties. As Mendeleev arranged the cards in order of ascending atomic weight, grouping elements of similar properties together, the periodic table was formed. Although Mendelee/s table demonstrated the periodic nature of elements.during the next century.scientists accurately explained why the properties of the elements recur periodically. Rutherford discovered nuclear charge and this charge, later termed the atomic number, was used to rumber the elements within the periodic table. Finally variations of the same elements, or isctopes having the same number of protons and electrons but differing numbers of neutrons, were discovered. How did later discoveries change the model of Mendeleev's periodic table to what we accept today? A Mendeleer's periodic table was labelled as inaccurato and his founding principles were scrapped B Elemeris were arranged by atomic number and properties of the elements vaned periodically with atomic number. C Write elemeris are arranged by atomic mass number, known familles of elements are organized by electron number D Elemerts vere arranged by the mass number of the nucleus and properties of thelements varied periodically with mass.

Question

Actinct Series" 2511 (252) in ud can in 1953.John Newlands presented a paper, classifying the 56 discovered elemerts into 11 groups based on similar physical properties. He noted that pairs of similar elements existed which differed by some multiple of eight in atomic weight. In 1884 Newlands published his version d the periodic table and proposed the Law of Octives stating that any given element exhibits analogous behavior to the eighth element following it in the table. Dimitri Mendeleev noticed patterns in the properties and atomic weights of halogens, alkali metals and alkaline metals. He also observed similarities between the series Cl-K-Ca, Br. Rb-Srandi-Cc-Ba. In an effort to extend this pattern to other elements, Mendeleev created a card for each element.containing the element's symbol atomic weight, and chemical and physical properties. As Mendeleev arranged the cards in order of ascending atomic weight, grouping elements of similar properties together, the periodic table was formed. Although Mendelee/s table demonstrated the periodic nature of elements.during the next century.scientists accurately explained why the properties of the elements recur periodically. Rutherford discovered nuclear charge and this charge, later termed the atomic number, was used to rumber the elements within the periodic table. Finally variations of the same elements, or isctopes having the same number of protons and electrons but differing numbers of neutrons, were discovered. How did later discoveries change the model of Mendeleev's periodic table to what we accept today? A Mendeleer's periodic table was labelled as inaccurato and his founding principles were scrapped B Elemeris were arranged by atomic number and properties of the elements vaned periodically with atomic number. C Write elemeris are arranged by atomic mass number, known familles of elements are organized by electron number D Elemerts vere arranged by the mass number of the nucleus and properties of thelements varied periodically with mass.

Answer 1

B. Elements were arranged by atomic number and properties of the elements varied periodically with atomic number.

Answer 2

Mendeleev's periodic table was initially based on atomic weight and the properties of elements. However, later discoveries, such as Rutherford's discovery of the nuclear charge, led to the understanding that the atomic number (the number of protons in the nucleus) is the fundamental property that defines the identity of an element. This led to the modern periodic table where elements are arranged by atomic number, and the periodicity of element properties is explained by their atomic number rather than atomic weight.

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