Which atom in the ground state has the same electron configuration as a calcium ion, Ca2+, in the ground state?(1) Ar(2) K(3) Mg(4) Ne

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01-06-2015
Chemistry

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Which atom in the ground state has the same electron configuration as a calcium ion, Ca2+, in the ground state?(1) Ar(2) K(3) Mg(4) Ne

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lulu1991 lulu1991 · Answer 1 · 2015-06-01T21:52:21-04:00

lulu1991 lulu1991

01-06-2015

The answer is (1) Ar. The electron configuration of calcium ion, Ca2+ is 2, 8, 8. The ground state of Ar atom also has electron configuration of 2, 8, 8. So the answer is (1).

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blahblahmali blahblahmali · Answer 2 · 2018-08-14T11:21:22-04:00

atoms are made of 3 types of subatomic particles; electrons, protons and neutrons

atomic number is the number of protons. atomic number is characteristic for the element. In ground state atoms, the number of electrons and protons are the same.

the electronic configuration of Ca in the ground state is

Ca - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

when Ca loses its 2 valence electrons, it becomes positively charged and the electronic configuration becomes

Ca - 1s² 2s² 2p⁶ 3s² 3p⁶

number of electrons in Ca²⁺ is 18

the atom in the ground state would have the same number of electrons and protons. Therefore number of protons are 18. then the atomic number of the element is 18

the atom having an atomic number of 18 is Ar.

the answer is 1) Ar

Which atom in the ground state has the same electron configuration as a calcium ion, Ca2+, in the ground state?(1) Ar(2) K(3) Mg(4) Ne

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