Start learning →

Sodium, magnesium, aluminium, silicon, phosphorus, sulphur, chlorine and argon belong to period:

A5
B3
C2
D4
Answer & Solution
Correct answer: B. 3
1. Their electrons fill the K, L and M shells. 2. Three occupied shells means the third row. 3. So they belong to period 3. _Source: syllabus Science Class X, Chapter 5, Periodic Classification of Elements._
Practise this question with Quill — Gujarat Board Class 10 (GSEB) →

Keep practising Periodic Classification of Elements

Browse all Periodic Classification of Elements questions for Gujarat Board Class 10 (GSEB), or explore more Chemistry topics.

Start a Periodic Classification of Elements lesson →
Related questions
Periodic table bingoType the numberSort the classificationsAcross or downSlice the periodic termsRun the periodic gatesPop the early attemptsCatch the metals