Halogens have seven valence electrons. These seven valence electrons allow the halogen group of elements to behave in a certain way and exhibit particular characteristics.Continue Reading
Because they have seven electrons in their outermost shell, halogens are extremely electronegative, meaning they have a great attraction for electrons. The tendency of halogens is to fill their outermost shell with their full complement -- eight electrons.
All halogens are extremely reactive and are generally not found alone in nature. The halogen group contains elements such as fluorine and chlorine. They usually bond with extremely electropositive elements such as sodium and potassium. Electropositive elements are electron donators; they don't hold on to their electrons very well.Learn more about Atoms & Molecules
To find the valence electrons in an atom, identify what group the element is in. An element in group 1A has 1 valence electron. For example, Li is in group 1A, so that means it has one valence electron. If the element is in group 2A, then it has two valence electrons.Full Answer >
The element manganese has seven valence electrons. The electronic configuration of manganese is [Ar] 3d5 4s2. The atomic number of manganese is 25 and it has 25 electrons out of which seven electrons are in the last shell or orbit.Full Answer >
Argon has eight valence electrons. Its electron configuration is 1s2 2s2p6 3s2p6, so it has three filled electron shells of 2, 8 and 8. The atomic number of argon is 18.Full Answer >
Molybdenum has six valence electrons. The atomic number of molybdenum is 42, and its electron configuration is 1s22s22p63s23p63d104s24p64d55s1 or 2, 8, 18, 13, 1 electrons per shell. The electrons in the 4d55s1 constitute its valence electrons.Full Answer >