HANHNGUYEN-25001_Periodic_Trends

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Chemistry

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Dec 6, 2023

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PRE-LAB QUESTIONS 1. What properties or characteristics affect how the periodic table is organized? Explain how each item affects the arrangement. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The period number of an element signifies the highest energy level an electron in that element occupies. The number of electrons in a period increases as one moves down the periodic table; therefore, as the energy level of the atom increases, the number of energy sub-levels per energy level increases. 2. What is the difference between a transition metal and an f-element? Transition metals oxidation state is +2 and f-element oxidation state is +3 3. In general, where are metals located on the periodic table? Explain why. They are located on the left side of the periodic table due to the tendency of losing electrons 4. What are the names of two metal groups? Alkali metals and Alkali Earth Metals. ©eScience Labs, LLC 2015 Periodic Trends in Atomic Properties
EXPERIMENT 1: CONSTRUCTION OF A PERIODIC TABLE Data Sheet Table 1: Periodic Trends Periodicity Observation What are the Group 1 elements called? Alkali Metals Within a group, what happens to the atomic radius as you go down the column? The number of energy levels increases Within a period, what happens to the atomic radius as the atomic number increases? It increases What is the general trend of electronegativity as you go left to right across the periodic table? Electronegativity increase What is the general trend of electronegativity as you go down the periodic table? Electronegativity decrease What group is silicon (Si) in? 14 How many protons does an atom of potassium (K) have? 19 In which group number is argon (Ar) found? 18 Is bromine (Br) a metal, a nonmetal, or a metalloid? Nonmetal What element in period 3 is a metalloid? Silicon (SI) What is the last element in period 4? Krypton What is the name of the element that has the atomic number 17? Chlorine What happens to electronegativity as you move down a group? It decreases Post-Lab Questions 1. Why do elements in the same group generally have similar properties? Provide one element as an example to support your reasoning. ©eScience Labs, LLC 2015 Periodic Trends in Atomic Properties
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