The elements with atomic numbers 10, 18, 36, 54 and 86 are:
Correct answer: B. Inert gases
- A. Light metals
- B. Inert gases
- C. Halogens
- D. Rare earth metals
Explanation
Option B is correct as Inert gases or Noble gases have their stable electronic subshell configurations. (ns2 np6 ) Hence, we can predict their atomic numbers as He has only K she'll so it's having 2 as the atomic number. Similarly, Ne has K(2 electrons) and L (8 electrons) having atomic number 10. In the same manner, we may predict the atomic number of Ar as it has K (2 electrons), L (8 electrons) and M shell (8 electrons) thus, having atomic number 18. Thus, all other options are rendered as incorrect.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Atomic Structure
Atomic structure covers the discovery of the proton, Planck's quantum theory, hydrogen emission spectra and the evidence for quantized energy levels. You will use quantum numbers to describe orbitals, distinguish s, p, d and f orbital shapes, and write electronic configurations, including the correct order of electron filling.
Practise Atomic Structure
922 free Atomic Structure MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Atomic Structure questions
The correct electronic configuration of Cr (Z - 24) is:
Which of the following orbital wil be filled first than 4p?
Which of the following does not have an inert gas configuration?
The wave-number of the first line in the Balmer series of Hydrogen is 15200 cm-1. Wave number of the first line in Balmer series of Be3+ is:
Sp hybrid orbitals are formed by the mixing of:
Diamond is a bad conductor because it: