Displacement reactions involving halogens . What are the group 7 elements called? For example, Te, or Tellurium, is in group 16 and row 5. Group 7 elements have 7 outer electrons and need to gain one electron. 1 decade ago. What happens with displacement in group 7? The group 7 elements are called the halogens. Favourite answer. 1 decade ago. To which group of the periodic table does this element belong? Which property do they most likely share? Together, this group of elements is called the ... Fluorine is the most reactive halogen, then the reactivity decreases as you go down Group 7. Somehow, they are very similar to their neighbouring elements of the table. as you go down the group to chlorine, bromine etc. The smaller the atom, the easier it is to grab an electron from another atom, making the atom more reactive. Fluorine, the most reactive element in the periodic table, has a low F–F bond dissociation energy due to repulsions between lone pairs of electrons on adjacent atoms. When halogens react with metals, they do so by gaining an extra electron into their outer shell in order to complete the shell with 8 electrons. Consistent with periodic trends, ionization energies decrease down the group. Lv 7. The further down the group you go, the less reactive the element is. As the period no. The most reactive element is fluorine, the first element in the halogen group. When chlorine (as a gas or dissolved in water) is added to sodium bromide solution, the chlorine takes the place of the bromine. The elements in Group 7 of the Periodic Table are all non-metals. Which halogen is a grey solid that turns into a purple gas when heated, and is used to sterilise wounds? We go to Group six and seven, we're gonna see that the bottom of these trends at least reactive p. O. Alexandra G. Vanderbilt University. Fluorine is the most reactive element in Group 7, and is even more reactive than chlorine. Its valence shell contains 2 electrons; They have low electronegativity; Compounds of alkali metals are often insoluble … As you go up group 7 (the halogens), again the elements get more reactive. Lv 4. Relevance. As with group 1 and 2, the trends in properties and GENERAL reactivity in group 7 can be explained by their electronic configuration: Modern Atomic Theory. What happens when Florine reacts? Very few scientists work with fluorine because it is so dangerous. Iodine is the least reactive halogen (besides astatine which is often ignored because it is extremely rare). The main Group 7 elements are fluorine, chlorine, bromine and iodine. A scientist studies an element that has seven electrons in its outer shell, is fairly toxic, and is highly reactive. All Group 17 (group VIIA or halogen) elements have 7 valence electrons (7 electrons in the valence shell or highest energy level). Answer. It is the most common element in the universe. F, fluorine is most reactive because it only needs one electron to fill its outer ring and the ring is closer to the nucleus so there is more pull. Periodic Table properties . Fluorine at the top of the group is most reactive, so they actually become less reactive as you go down the group. Which of these is a use for chlorine? It’s relatively large number of protons bind tightly to its electrons, so that the atom is overall rather small. 4 years … Answer Save. What is most reactive element in Group 7? All of these three elements are group 7 elements in the periodic table. The more reactive elements on the periodic table are farther down in the rows. ; The most reactive metal is francium, the last alkali metal (and most expensive element).However, francium is an unstable radioactive element, only found in trace amounts. This is because the extra shielding that made it easier to lose the electron for the group 1 atoms, makes it harder for the group 7 atoms to gain an electron. 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