![]() How do you know which element is more reactive? For Metals: the most reactive metals are those that can lose their valence electrons the most easily. Nonmetal reactivity decreases down a group because the nucleus’ ability to gain more valence electrons weakens due to more nuclear shielding. ![]() Why is the trend in reactivity different for metals and nonmetals? This occurs as atoms more readily accept electrons to fill a valence shell than lose them to remove the unfilled shell. Metallic character decreases as you move across a period in the periodic table from left to right. There are trends in metallic character as you move across and down the periodic table. Electronegative is the atoms ability to attract other bonded atoms. For example elements can be arranged by their electronegative, electron affinity, atomic radius, or ionization energy. Periodic trends affect bonding, because of how the elements are arranged on the periodic table. How does periodic trends affect the elements? Within a period, protons are added to the nucleus as electrons are being added to the same principal energy level. There are some small exceptions, such as the oxygen radius being slightly greater than the nitrogen radius. Periodic Trend The atomic radius of atoms generally decreases from left to right across a period. This pulls the electron cloud closer to the nucleus, strengthening the nuclear attraction to the outer-most electron, and is more difficult to remove (requires more energy). As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.Īcross a period, effective nuclear charge increases as electron shielding remains constant. On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. What is the trend in the electronegativity and why? Group Trend: as you go down a column, ionization energy decreases. Periodic Trend: as you go across a period, (L to R), atomic radius decreases. Group Trend: as you go down a column, atomic radius increases. Non-Metal Reactivity/Electron Affinity.Metallic Character/Metallic Reactivity.Definition: How much the outer electrons (-) are attracted to the nucleus (+) ![]() What are two trends in the periodic table? Nonmetal reactivity increases from left to right and decreases down groups. nonmetallic characteristics increases from left to right and decreases down groups. Metal reactivity decreases from left to right across periods and increases down groups. What is the trend in the reactivity of metals? These trends exist because of the similar atomic structure of the elements within their respective group families or periods, and because of the periodic nature of the elements. Why are there trends in the periodic table? ![]()
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