All halogens have 7 valence electrons. They gain one electron and achieve noble gas electronic configuration
The alkaline earth metals.
halogens
halogens
nitrogen will get noble gas configuration by adding three more electrons.
The alkaline earth elements electron structure end in s2
They have one valence electron. If this electron is lost, the atoms form cations with the electronic configuration of the nearest noble gas.
That is the element phosphorous
The element calcium, or Ca, is located in group 2, period 4 of the periodic table. Therefore, its electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2. This can also be written as [Ar] 4s2, because the beginning of that electron configuration is the same as argon's. The 42 you mentioned in your question is referring to a specific isotope of calcium and has nothing to with the electron configuration.
nitrogen will get noble gas configuration by adding three more electrons.
K+And the K ion configuration is 1s2 2s2 2p6 3s2 3p6Noble gases have the configuration up to 3p6Pseudo noble gases have it up to 3d10
The group of elements that have a stable electron configuration are the noble gases.
Group 17 and group 16 in general.
It is in group 17.
All halogens or group 17 elements.
1
The alkaline earth elements electron structure end in s2
The electronic configuration for aluminum is 1s22s22p63s23p1 .
negative ions
(n-1)d2ns2, where n is the energy level. For example, Titanium's ending electron configuration is 3d24s2.
Electron Configuration