Answer
Verified
39k+ views
Hint: Electron configuration is the distribution of electrons of an atom, ion or molecule in atomic or molecular orbital. From the periodic table we know calcium exists in the 2nd group and 4th period in s group.
Complete step-by-step answer:
If we know the periodic table then from there we can find that the atomic number of calcium is 20. Atomic number tells us about the number of electrons and protons in an atom.
So, calcium is an s-block 2nd group element and it can give 2 electrons to make 2+ charges on neutral calcium. Calcium ion exists with 2+ charges on it. So, the number of electrons in calcium ions is 18. If we fill these electrons in orbitals from low energy level to high energy level. First, we see the electron configuration of Calcium: \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}4{{s}^{2}}\]
So, there are 2 electrons (valence electrons) in the 4s subshell of calcium which is on its highest energy level and it can release these 2 electrons to make itself stable. So, 2+ charges exist on calcium ions. The calcium ions have 18 electrons which are isoelectronic with noble gas argon, and if we fill these electrons in orbital then its electron configuration: \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}\]
So, “A” is the correct answer.
Additional information:
s subshell has one orbital and p subshell has three orbital. The order of electron orbital energy levels, starting from least to greatest, is as follows: 1s, 2s, 2p, 3s, 3p, 4s,3d, 4p, 5s, 4d,5p,6s,4f,5d, 6p, 7s, 5f, 6d, 7p. These energy levels we can find from the “n+l” rule.
Note: The electron configuration of calcium and calcium ion are different. Remember the energy order of subshells and numbers of orbitals they have.
Complete step-by-step answer:
If we know the periodic table then from there we can find that the atomic number of calcium is 20. Atomic number tells us about the number of electrons and protons in an atom.
So, calcium is an s-block 2nd group element and it can give 2 electrons to make 2+ charges on neutral calcium. Calcium ion exists with 2+ charges on it. So, the number of electrons in calcium ions is 18. If we fill these electrons in orbitals from low energy level to high energy level. First, we see the electron configuration of Calcium: \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}4{{s}^{2}}\]
So, there are 2 electrons (valence electrons) in the 4s subshell of calcium which is on its highest energy level and it can release these 2 electrons to make itself stable. So, 2+ charges exist on calcium ions. The calcium ions have 18 electrons which are isoelectronic with noble gas argon, and if we fill these electrons in orbital then its electron configuration: \[1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}\]
So, “A” is the correct answer.
Additional information:
s subshell has one orbital and p subshell has three orbital. The order of electron orbital energy levels, starting from least to greatest, is as follows: 1s, 2s, 2p, 3s, 3p, 4s,3d, 4p, 5s, 4d,5p,6s,4f,5d, 6p, 7s, 5f, 6d, 7p. These energy levels we can find from the “n+l” rule.
Note: The electron configuration of calcium and calcium ion are different. Remember the energy order of subshells and numbers of orbitals they have.
Recently Updated Pages
silver wire has diameter 04mm and resistivity 16 times class 12 physics JEE_Main
A parallel plate capacitor has a capacitance C When class 12 physics JEE_Main
A series combination of n1 capacitors each of value class 12 physics JEE_Main
When propyne is treated with aqueous H2SO4 in presence class 12 chemistry JEE_Main
Which of the following is not true in the case of motion class 12 physics JEE_Main
The length of a potentiometer wire is 10m The distance class 12 physics JEE_MAIN
Other Pages
A closed organ pipe and an open organ pipe are tuned class 11 physics JEE_Main
A convex lens is dipped in a liquid whose refractive class 12 physics JEE_Main
Iodoform can be prepared from all except A Acetaldehyde class 12 chemistry JEE_Main
The resultant of vec A and vec B is perpendicular to class 11 physics JEE_Main
448 litres of methane at NTP corresponds to A 12times class 11 chemistry JEE_Main
Dissolving 120g of urea molwt60 in 1000g of water gave class 11 chemistry JEE_Main