The configuration [He] 2s2 2p2 describes the element in the 2nd row (since He finishes the first row) in the second of the 'p' columns, #14. This corresponds to the element carbon.
There are many elements among the transitional elements which has the electron configuration differed than predicted. Such element with the lowest atomic number is chromium.
The element that has a single electron in the 2p sublevel is boron. The electron configuration of Boron is 1s22s22p1.
The electron configuration of the element with the atomic number 39 (yttrium) is: [Kr]4d15s2.
The element with that electron configuration is Iron.
Generally electron affinity goes up as you go from left to right across the periodic table, and decreases as you go down a column. However, fluorine is an exception -- and the element with the highest electron affinity is chlorine.(Note that the most electronegative element is fluorine however; 'electronegativity' is not exactly the same as 'electron affinity'.)Electronegativity is the ability of an atom in a molecule to draw bonding electrons to itselfElectron affinity is a measure of the energy change when an electron is added to a neutral atom to form a negative ion.The reason that the electron affinity is not as high as might otherwise be predicted for fluorine, is that it is an extremely small atom, and so it's electron density is very high. Adding an additional electron is therefore not quite as favorable as for an element like chlorine where the electron density is slightly lower (due to electron-electron repulsion between the added electron and the other electrons in the electron cloud).
The element gold (atomic number 79) has the electron conguration of [Xe] 4f14 5d10 6s1
There are many elements among the transitional elements which has the electron configuration differed than predicted. Such element with the lowest atomic number is chromium.
It's predicted that this element will be shown to have seven. Please see the link.
Helium has no electron affinity.
An electron is not an element.
The element that has a single electron in the 2p sublevel is boron. The electron configuration of Boron is 1s22s22p1.
The electron is not a chemical element: it is a small elementary particle with a negative electrical charge.
The electron configuration of the element with the atomic number 39 (yttrium) is: [Kr]4d15s2.
The element with 1 electron in period 1 would be hydrogen.
The element with that electron configuration is Iron.
Unbipentium, but the element is only predicted at this moment and has never been observed.
You don't. Calcium is not an electron, calcium is a element