Question

Elements which have balance electrons 1 or 2 or 3 are​

Answer 1

Group 1 (I) (alkali metals) 1

Group 2 (II) (alkaline earth metals) and helium 2

Lanthanides and actinides 3–16

Groups 3-12 (transition metals) 3–12

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Answer 2

Explanation:

The number of valence electrons

Periodic table groupValence ElectronsGroup 1 (I) (alkali metals)1Group 2 (II) (alkaline earth metals)2Groups 3-12 (transition metals)2* (The 4s shell is complete and cannot hold any more electrons)Group 13 (III) (boron group)3