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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements2 Marks
Question
The atomic numbers of three elements A, B and C are given below:
Element Atomic Number
A 5
B 7
C 10
  1. Which element belongs to group 18?
  2. Which element belongs to group 15?
  3. Which element belongs to group 13?
  4. To which period/ periods do these elements belong?
✓

Answer

i. C $(2,8)$.
ii. B $(2,5)$.
iii. $A(2,3)$.
iv. $2^{\text {nd }}$ period ( 2 shells are filled).

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