Question

what is the number of valence electrons in the atom of --- (a) a halogen (b) an alkali metal​

Answer 1

Answer:

Periodic table group Valence electrons

Group 1 (I) (alkali metals) 1

Group 2 (II) (alkaline earth metals) 2

Lanthanides and actinides 3–16

Groups 3-12 (transition metals) 3–12

Explanation:

Answer 2

Explanation:

halogens -7

alkali metal- 1