![]() If the abundance of 85Rb is 80.2% and the abundance of 87Rb is 19.8%, what is the average atomic mass of rubidium?Ģ6 The size of atoms can be measured using the diffraction of x-rays The attractive force between the protons and electrons increases.Ģ5 Rubidium is a soft, silvery-white metal that has two common isotopes, 85Rb and 87Rb. The attractive force between the protons and neutrons increases. The number of outermost electrons increases. The number of outermost electrons decreases. What change causes this decrease in diameter of atoms? A. The atomic radii increase, moving across a period to the left and down in a group.Ģ4 The diameter of neutral atoms generally decreases going left to right across one period on the periodic table. The atomic radii increase, moving across a period to the right and up in a group. The atomic radii increase, moving across a period to the left and up in a group. The atomic radii increase, moving across a period to the right and down in a group. ![]() have the same atomic mass number.Ģ3 Which statement BEST describes the trend in atomic radii observed in the periodic table?Ī. State the number of valence electrons, the ion formation, and make a statement that connects the two in terms of energy.Ģ2 Certain elements with similar chemical and physical properties are found in the same column in the periodic table of the elements. Substance State Conductor of Electricity? Shiny/Dull 1 Liquid No Dull 2 Solid No Shiny 3 Solid Yes Shiny Liquid Yes Dull Based on the table, which substance is MOST likely a metal? A.đ B.Ē C.ē D.Ĕ Which element listed has the FEWEST valence electrons? A. Which of these nonmetals is more reactive-bromine or krypton? Explain your answer based on the outer most electrons.ġ9 The number of valence electrons in an element affects the reactivity of that element. D.ěoth diagrams will show six valence electrons.ġ8 Which of these nonmetals is more reactive-bromine or krypton C.ěoth diagrams will show two electron orbitals. B.ěoth diagrams will show eight neutrons. They are radioactive.ġ6 Based on its position in the periodic table of the elements, how many valence electrons does phosphorus have?ġ7 How will a diagram of a sulfur (S) atom be similar to the oxygen diagram?Ī.ěoth diagrams will show eight protons. It must lose one proton.ġ5 Almost all of the elements found on the left side of the periodic table have which of these properties in common? A. In order to make the sodium ion, what must occur to the sodium atom A. group 18 (8A)ġ3 Based on the periodic table, how many protons are found in an atom of iron (Fe)ġ4 A sodium atom must contain 11 protons, 12 neutrons, and 11 electronsĪ sodium atom must contain 11 protons, 12 neutrons, and 11 electrons. calciumġ2 Which group on the periodic table contains elements that are the LEAST reactive?Ī. Which of these elements has properties similar to sodium? A. Sodium is a metal with one valence electron. a positive core surrounded by densely packed matterġ1 Sodium is a metal with one valence electron a positive core surrounded by mostly empty space D. a neutral core surrounded by mostly empty space C. a negative core surrounded by densely packed matter B. neutrons.ġ0 How is the structure of an atom BEST described?Ī. ![]() Mass Number(A) Number of Protons Number of Electrons Number of Neutrons 23Na K 40 19 F 10 131I 109 47 46 36S Cr 53ĩ The difference between the atomic number of an element and the element’s atomic mass is the number of A. Positive ions are called _ while negative ions are called _Ħ Explain why cations are smaller than the neutral atom.ħ Isotopes have a different number of _Ĩ 23Na K 40 19 F 10 131I 109 47 46 36S Cr 53 Symbol Atomic Number(Z) the minimum distance between the electron and the nucleusģ An atom has a net charge of _Ĥ Ions are produced when an atom gains or loses an _ĥ. the average distance between the electron and the nucleus D. the probability of the electron location C. So the electron configuration of bromine will be 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 5.Presentation on theme: "Atom, PTE, Trends, Bohr Model Review"- Presentation transcript:Ģ In the electron cloud (Schrodinger) of the atom, what does the cloud represent?Ī. We know that each s subshell can hold maximum 2 electrons, each p subshell can hold maximum 6 electrons, each d subshell can hold maximum 10 electrons, and each f subshell can hold maximum 14 electrons.Īlso, we have to make sure that the electron configuration will match the order of aufbau principle (i.e., the 1s subshell is filled first and then 2s, 2p, 3s… and so on). The 1 st electron shell contains 1s subshell, the 2 nd electron shell contains 2s and 2p subshells, the 3 rd electron shell contains 3s, 3p, and 3d subshells, and the 4 th electron shell contains 4s subshell. Similarly, 2 represents the 2 nd electron shell, 3 represents the 3 rd electron shell, and 4 represents the 4 th electron shell. In the above image, 1 represents the 1 st electron shell.
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