As elements, chlorine and fluorine are gases at room temperature, bromine is a dark orange liquid, and iodine is a dark purple-gray solid. The makes them highly electronegative, and prone to forming ionic bonds with metals, especially the alkali metal group and the alkaline earth group. Tags: Question 20 . It is a corrosive and highly toxic gas. Both molecules have the same total number of electrons, namely, 18, but in C. This phenomenon can be explained by Hund's rule, which states that orbitals that are empty, half-full, or full are more stable than those that are not. (b) This is … It’s number of valence electrons is the same as the members of the Alkali Metal family. 3. This means that each of these elements have an electron configuration that ends as s^2p^5 F 1s^2 2s^2 2p^5 Cl 1s^2 2s^2 2p^6 3s^2 3p^5 Br 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^5 Each Halogen ends in s^2p^5 with 7 valence electrons. Which of the semi-metals that have their valence electrons in the fourth . In any case, electron configuration is one of the ways halogens can be defined: all have seven valence electrons. SURVEY . All of the elements in Group 17 (or 7A) are called halogens. Chlorine, bromine, and iodine have valence shell d orbitals and can expand their valence shells to hold as many as 14 valence electrons. The valence electrons, which occupy the highest energy levels of an atom, are the electrons that bond one element to another. Answer: They all have the same valance electrons i.e. Most reactive group of non-metals, achieve stable electron configurations by gaining one electron. Each group has the same number of valence electrons. Halogens. Related Halogens all have 7 valence electrons, meaning they only require 1 more electron to reach the desired 8 in the valence. How many valence electrons do the halogens possess? Halogens are highly reactive, and as such can be harmful or lethal to biological organisms in sufficient quantities. Halogen - Halogen - Relative reactivity: The great reactivity of fluorine largely stems from the relatively low dissociation energy, a standard measure for bond energies, of the F―F bond (37.7 kilocalories per mole) and its ability to form stable strong bonds with essentially all the other elements. Cl 20. Ga 19. A) 5 B) 6 C) 2 D) 1 E) 7 Jan 09 2021 02:17 PM. November 30, 2020 by Veerendra. Solids in this family consist of Iodine and Astatine, gasses are Fluorine and Chlorine, and Bromine is a liquid. They have seven valence electrons, so they are very "eager" to gain one electron to have a full outer energy level. All atoms are most stable with (or would "prefer") how many electrons in their valence shell? 2. As the atomic radius increases down group 17, so does the melting point. The ability of halogen atoms to work as hydrogen bond acceptors was recognized as early as the 1920s, and halogen atoms of halocarbons can function as electron donor sites also to several other elements, e.g., when coordinating alkali-metal or alkaline-earth-metal cations. 8. 60 seconds . Does not have the identical outer electron configuration. They attain the octet either by accepting an electron to form a univalent anion, X-, (F-, Cl-, Br- and I-) by sharing the unpaired electron with the unpaired electron of another atom to form a covalent bond (as in Cl2, Br2, HCI, HF etc). Halogens are the group (vertical column) of elements on the periodic table that lie 2nd from the from right side. The chemistry of the halogens is dominated by oxidation-reduction reactions. Each halogen atom will gain one electron to achieve a stable octet electron arrangement. Members of the halogens include: Select the best answer from the choices. When going down Group 17, the atomic size of halogens increases. All halogens have seven valence electrons, but as the atomic size increases, the attraction between the nucleus and these outer electrons decreases. F 17. They are a highly reactive, corrosive and poisonous group of elements, and they are the only group to possess three states of matter at once. halogens valence electrons. Physical and Chemical Properties of Group 17 Elements Group 17 Elements: The HalogensThe elements in Group 17 are: Fluorine Chlorine Bromine Iodine Astatine These elements are known as halogens. State at room temperature Room temperature is usually taken as being 25°C. However, there are occasional exceptions to the rule (e.g. They need one electron to complete their octet. Nevertheless, at GCSE level, it is useful to characterise elements by their valence outermost electrons and electron configuration. These are often referred to as the "outer shell" of an atom, though the actual structure is much more complex. They are one electron short of having the full outer s and p sublevel, which makes them very reactive. 7 valence electrons. Electrons in the second shell. When they form ions, they tend to gain an electron and form negative ions. 18. Transition metals Does not have the identical outer electron configuration . Noble Gases. Since they only require 1 more electron, the halogens are quite reactive. The halogens - including fluorine, chlorine and bromine - have a common tendency to form salts, but they are all of a toxic nature. Have two valence electrons and get to a stable electron configuration by losing two electrons. 20. The transition elements have their valence electrons in orbitals of more than one energy level, but the representative elements have their valence electrons in orbitals of only one energy level. Therefore, the common valency of halogen family is 1. Halogens form diatomic molecules (of the form X 2 , where X denotes a halogen atom) in their elemental states. Fluorine is one of the most reactive elements. Halogens are highly reactive as a result. Why halogens are called halogens? Electrons closest to the nucleus. for transition metals, a valence electron can also be in the inner shell, so it can have more than one type of valence). Which of the halogens is the most active? The outermost occupied shell becomes further away from the nucleus and is screened by more inner shells containing electrons. In general, t he number of valence electrons corresponds to the Group number. Introduction. The halogen group of the periodic table is group 17, so all halogens have a total of seven valence (bonding) electrons in their outer shell. 4. The group 17 elements of the periodic table have 7 valence electrons and are highly reactive, with low melting and boiling points. 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