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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom2 Marks
Question
What valencies will be shown by the elements $A, B, C, D$ and $E$ having atomic numbers $2, 4, 8, 10,$ and $13$ respectively.
✓

Answer

Valency shown by $A($atomic no. $2) – 0$
Valency shown by $B($atomic no. $4) – 2$
Valency shown by $C($atomic no. $8) – 2$
Valency shown by $D($atomic no. $10) – 0$
Valency shown by $E($atomic no. $13) – 3$

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