1s2 2s2 2p63s23p64s2
Calcium (Ca) has 20 electrons and its electron configuration is [Ar] 4s². To attain a noble gas electron configuration, calcium needs to lose two electrons to achieve the stable electron configuration of argon ([Ar] 4s² 3d¹⁰).
Calcium has two valence electrons, both of which are unpaired. •Ca•
The element with this electron configuration is calcium (Ca), which has 20 electrons.
Calcium (Ca) has 20 electrons in its neutral state. To attain a noble gas electron configuration (like argon), calcium would need to lose 2 electrons to have the same electron configuration as argon, as argon has 18 electrons.
The ionic symbol for calcium is Ca^2+. It indicates that calcium has lost two electrons to achieve a stable electron configuration in its outer shell.
Calcium (Ca) has 20 electrons and its electron configuration is [Ar] 4s². To attain a noble gas electron configuration, calcium needs to lose two electrons to achieve the stable electron configuration of argon ([Ar] 4s² 3d¹⁰).
Calcium has two valence electrons, both of which are unpaired. •Ca•
Calcium loses two electrons to obtain a noble-gas electron configuration.
The element with this electron configuration is calcium (Ca), which has 20 electrons.
Calcium, or Ca
Calcium (Ca) has 20 electrons in its neutral state. To attain a noble gas electron configuration (like argon), calcium would need to lose 2 electrons to have the same electron configuration as argon, as argon has 18 electrons.
The electron configuration of calcium using noble gas notation is [Ar] 4s2. This notation indicates that calcium has the same electron configuration as argon ([Ar]) up to the 18th electron, and then adds two electrons to fill the 4s energy level.
The ions that have the same electron configuration as Argon (Ar) are the potassium ion (K⁺) and the calcium ion (Ca²⁺). Both of these ions lose electrons, resulting in an electron configuration that matches that of Argon, which is 1s² 2s² 2p⁶ 3s² 3p⁶. K⁺ has one less electron than neutral potassium (K), while Ca²⁺ has two fewer electrons than neutral calcium (Ca).
The ionic symbol for calcium is Ca^2+. It indicates that calcium has lost two electrons to achieve a stable electron configuration in its outer shell.
Ca
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.
No, potassium (K) in its K2+ cation form and calcium (Ca) have different electronic configurations than argon (Ar). Potassium has an electron configuration of [Ar] 4s1 and calcium has an electron configuration of [Ar] 4s2. In contrast, argon has an electron configuration of 1s2 2s2 2p6 3s2 3p6.