Question

Identify the outer electron configurations for the (a) alkali metals, (b) alkaline earth metals, (c) halogens, (d) noble gases.

Answer 1

Answer:

A)ns¹

B)ns²

C)ns² np⁵

D)ns² np⁶

Explanation;

A) Alkaline metals are found in group 1A of periodic table with outer electron configuration ( ns¹)

Li = 1s

Na =3s

K. = 4s

Rb. = 5s

Cs =6s

Fr. =7s

n symbolize the main energy level: 1, 2, 3, 4, 5, 6,7.

B)Alkaline Earth metals are found in group 2A of periodic table with outer electron configuration ( ns²)

Be. =2s2

Mg. =3s2

Ca. = 4s2

Sr:. = 5s2

Ba: =6s2

Ra:. =7s2

n symbolize the main energy level: 1, 2, 3, 4, 5, 6,7.

C)The Halogens are found in group 1A of periodic table with outer electron configuration ( ns² np⁵ )

F: =2s2 2p5

Cl: = 3s2 3p5

Br: = 4s2 4p5

I: =5s2 5p5

n symbolize the main energy level: 1, 2, 3, 4, 5, 6,7.

D)The Noble gsas are found in group 1A of periodic table with outer electron configuration ( ns² np⁶ )

=> He: 1s2

Ne = 2s2 2p6

Ar = 3s2 3p6

Kr = 4s2 4p6

Xe = 5s2 5p6

Rn = 6s2 6p6

n symbolize the main energy level: 1, 2, 3, 4, 5, 6,7.