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Fluorine has 7 valence electrons and needs 1 more to achieve a stable octet configuration. It is easier for fluorine to gain 1 electron rather than lose 7 to complete its valence shell, making it more favorable for it to gain one electron.
Gaining of 1 electron take Fluorine to nobel gas state
Lithium electron configuration: 1s2 2s1, or in shorthand: [He] 2s1 Thus in LiF the Li cation (Li missing one electron to get its nobel gas configuration of He) it is Li+: 1s2 2s0, or in shorthand: [He] 2s0, This ion does NOT have 8 (octet) electrons, although it has a nobel gas configuration of He: 1s2.
The elements in a period follow this progression due to their electronic configurations. The elements on the left side of the period are metals, which have 1-3 electrons in their outermost shell. Moving towards the right, the elements become metalloids and nonmetals with 4-7 electrons in their outer shell, before reaching the noble gases with a full valence shell of 8 electrons. This pattern is driven by the tendency to achieve a stable electron configuration.
The column next to the noble gases in the periodic table is the halogens group. Halogens are highly reactive because they only need one more electron to complete their outer electron shell and achieve a stable electron configuration. This makes them eager to chemically react with other elements to gain that electron and become stable.
Cs does not have a nobel gas electron configuration, as it contains one valence electron in its outermost s orbital. Be3+ also does have a nobel gas electron configuration, as this occurs when Be has a 2+ charge (the typical Be ion is Be2+).
The Alkali Metals loose one electron in order to achieve a nobel gas configuration.
Halogens have 7 valence electrons and nobel gases have 8. Each atom wants 8 or none electrons according to the octet rule. Therefore, nobel gases are relatively unreactive b/c they already have 8 Halogens only need 1 more valence electron, making them very reactive.
nobel gases has few electron in the outer energy level
Fluorine has 7 valence electrons and needs 1 more to achieve a stable octet configuration. It is easier for fluorine to gain 1 electron rather than lose 7 to complete its valence shell, making it more favorable for it to gain one electron.
Gaining of 1 electron take Fluorine to nobel gas state
A noble gas configuration refers to the electron configuration of a noble gas element, which is very stable and does not easily react with other elements. It typically involves having a full outer electron shell, with 8 electrons for most elements except helium which has 2 electrons. Elements strive to achieve a noble gas configuration through gaining, losing, or sharing electrons in chemical reactions.
The stable ions of all the elements except the Transition metals, Actinide, and Lanthanide series (that is the d and f block elements) form stable ions that are isoelectronic to a nobel gas by gaining or losing electrons in order to achieve an s2 p6 stable octet. For example, sodium will lose one electron to have the same electron configuration as neon, while nitrogen will gain three electrons to become isoelectronic to neon.
Halogens are in the seventh group on the periodic table, and thus have seven electrons in their outer shell. In order to attain a noble gas configuration, it must gain an electron to form an octet, which is when eight electrons are in the outer shell.
Take a look at the shells, each has a certain number electrons orbiting the central nucleus, in the case of the Nobel Gases, they all have 8 electrons except of course for hydrogen which has 2. Each ring has a certain number of electrons which causes the atom to be more stable than others. The outermost is called a valence electron shell. In the case of the Nobel Gases it causes the element not to be as reactive to other substances. Depending upon how many electrons are in the outer shell, will denote how reactive an atom will be. Those atoms with only 1 electron, will be quite non reactive where as those that are missing just one electron from making it complete will be quite reactive. They have the same outer electron structure.
According to the Octet Rule, the most valence electrons any atom can have is 8. Atoms naturally want to meet this rule either by losing or gaining enough electrons to have a total of 8 valence electrons. The nobel gases have exactly 8 valence electrons. The neither need to lose or gain any and therefore do not play well with others. The losing or gaining of valence electrons determines the stability and reactivity of the element.
hendrik antoon lorentz a dutch physiscist who won a nobel prize in1902 for developing the mathematical theory of the electron