Asap! 20 points brainliest if right elements in the same ? have the same number of valence electrons. elements in the same ? have the same number of electron shells. metallic elements become ? reactive as you move left to right in a period. metallic elements become ? reactive as you move top to bottom in a group.

Elements in the same Group have the same number of valence electrons.

Elements in the same Period  have the same number of electron shells.

Metallic elements become Less reactive as you move left to right in a period.

Metallic elements become More  reactive as you move top to bottom in a group.

we know that

applying the law of sines

°

so

∠j=18°

∠k=29°

∠l=180-(18+29)=133°

the answer part a) is

the measure of angle k is  ≈29°

part b)  the measure of angle k could also be

(180-29)=151°

so

∠j=18°

∠k=151°

∠l=180-(18+151)=11°

the answer part b) is

the measure of angle k could also be 151°

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