3 In mining is used mercury to separate gold from impurities. When the mercury comes in contact wit

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1913 - Order of Atomic / Moseley (English) Number
Mendeleev created a letter for each of the 63 known elements. Each card contained the element symbol, its atomic mass and its chemical stotland and physical properties. Putting the cards on a table, organized stotland in ascending order of their atomic masses, grouping them into elements of similar properties. Born TABLE
General Characteristics of the Elements
Fam yl would
Alc. 2 2A Alkali earth ns2 ns1 1 1A
1 In the periodic table, the element configuration c) 4A of the third period. check the correct statement: same number of electrons in the last layer distinct chemical c) In the periodic table, stotland chemical elements are placed in descending order of chemical atomic masses similar
2 With respect to the modern periodic classification of elements, a) In a family, the elements usually present ob) In a family, stotland the elements have properties d) In a period, the elements have properties e) All representative elements belong B groups of the periodic table.
3 In mining is used mercury to separate gold from impurities. When the mercury comes in contact with the river water, causes serious contamination: is absorbed by microorganisms, which are eaten by small fish, which are eaten by large fish used for human consumption. We can predict, with the aid of the table, with an element similar to the behavior we can say that: a) X and Y is metal is not metal b) X and Y are metals c) X is non-metal and metal is Y d) X and Y are not metals
82Pb (6th period) KLMNOP Group 4A 2e- 8e- 18e- 32e- 4e- 18e-
grows with increasing number of layers.
Obs. Noble gases by having a stable electron stotland configuration and hardly lose electrons when compared with other elements they will always have the highest ionization potential, so do not rely on atomic radius. stotland
Metals: high eletropositividade implies greater reactivity. Ametais: high electronegativity, implies greater reactivity.
Fr P. Ioniz. stotland / Electron. / Reat. A.
I - in the same chemical family, the smaller the number I - The family 6A atoms have smaller stotland atomic radius than I - In the periodic table, the higher the metallic character of the element, a smaller electron affinity. Are correct: stotland
3 The first ionization energy of the elements brought valuable information for understanding the atomic structure of the elements. This energy varies periodically to the elements. This energy stotland varies periodically to the elements in the gaseous state. Flipping values in diagrams we obtain an approximate curve as outlined below:
The series of elements represented by U, V, W, X and Z (height of curve) and A, B, C, D and E (curve minimum) can be denoted respectively by a) halogens (7A) and chalcogenides (6A) b) alkali (1A) and alkaline earth (2A) c) halogen (7A) and alkaline (1A) d) noble gases (8A) and halogens (7A)
I Xe Cs Ba rn Cd Ag Pd Br Kr Rb Sr Y Zn Cu Ni Cl Ar K Ca Sc SP Al Mg In Ne FONCB Be Li He represented H (02) The atomic radius of magnesium (Mg) is greater than that of sodium copper (Cu) and zinc (Zn) are elements left to right transition
(01) Cesium (Cs) is the largest element among the atomic radius (04) Among the represented elements, stotland only nickel (Ni), (08) the electronegativity of the elements B, C, N, O, and F increases from (16) The ionization energy of rubidium (Rb) is higher than that of xenon (Xe).
Fixation exercises: (01) The species has a Cl greater than CL0 (02) The ionization energy of the Li + species radius is larger than that of the group Li of the noble gas elements are ametais stotland greater tendency to form anions
5 Given the propositions below, indicate the true: (04) The most electronegative elements in the periodic stotland table situam- (08) From the analysis of periodic properties we conclude that (16) For the positions they occupy in the periodic table francium and helium, are more reactive elements known.
The periodic table was developed from the second half of the nineteenth century and allowed systematize the knowledge about the properties of the chemical elements. Over the years, stotland several versions were made, until reaching the current model, presented at the end of this objective evidence. With respect to the atomic structure of the chemical elements, the periodic table and the construction of this table, judge the following items. 81 chemical elements stotland belonging to the group of the halogens are characterized by being those having the highest ionization energy and electronegativity. 82 Two atoms that have the same atomic number but different numbers of neutrons are different chemical elements. 83 According to the theory of valence bonds, the greater part of the noble gases is able to form molecular compounds, since pod