5 Questions
Which charged ion will be formed by an element of group IIA with electronic configuration 1s2 2s2 2p6 3s2?
A+2
Which pair of subshells has the lowest energy as compared to other pairs?
1s,2s
What is the maximum number of electrons that can be accommodated in the 3rd principal energy level?
18
Which of the following elements is a halogen?
Chlorine
What is the atomic number of the element with the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1?
36
Study Notes
Ion Formation
- An element of group IIA with electronic configuration 1s2 2s2 2p6 3s2 will form a +2 charged ion.
Subshell Energy
- The 1s2 subshell has the lowest energy compared to other pairs.
Electron Accommodation
- The maximum number of electrons that can be accommodated in the 3rd principal energy level is 18.
Halogen Elements
- Fluorine (F) is a halogen element.
Atomic Number
- The element with the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 has an atomic number of 31, which is Gallium (Ga).
This quiz covers Section A of Chemistry for SSC-I, with a time limit of 20 minutes. Test your knowledge and skills in chemistry with this assessment.
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