An element has configuration 2, 8, 1. It belongs to, _.
Correct answer: A. IA group and 3rd period
- A. IA group and 3rd period
- B. IIIA group and 1st period
- C. IA group and 8th period
- D. VIIA group and 3rd period
Explanation
Elements' position in the periodic table can be determined by its electronic configuration. Period can be determined by counting the number of shells its electrons occupy. Since the element shown occupies three shells so we can say that it is in Period III. Group can be determined number of electrons in the last shell. Since the element has 1 electron in its last shell so the group number of this element is 1.Hence the answer is A.
Last updated
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.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
168 O-2 has how many electrons in s-orbitals?
3s2, 3p4 valence shell electronic configuration corresponds to ?
6Y = 2s12P1x2P1y2P1z this is_configuration
A 1-kW radio frequency of 880 KHz. How many quantas per second does it emit?
A 1kW radio transmitter operates at a frequency of 880 kHz. How many quanta per second does it emit?