Question

1. a) A neutral atom has the following characteristics:

- it has 8 valence electrons

- it's a transition metal

- the highest quantum level occupied is n = 4

What is the identity of this atom? Enter either the element name or symbol

1. b)

A neutral atom has the following characteristics:

- it has 5 valence electrons

- it's a main group element

- the highest quantum level occupied is n = 4

What is the identity of this atom? Enter either the element name or symbol (case insensitive).

Answer 1

1 a) 8 valence electrons

transition metal - so it is d-block metal

n = 4 i.e the energy level is 4

the possible elemnt is => IRON i.e Fe

Fe has the electron configuration => 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶ Or [Ar] 4s² 3d⁶ = so it has 8 valence electrons

answer => Fe i.e IRON

1b) 5 valence electrons

main group element - S & P block elements

n = 4 i.e the energy level is 4

the possible elemnt is => Arsenic (As)

Fe has the electron configuration => 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p³ Or [Ar] 4s² 3d¹⁰ 4p³ = so it has 5 valence electrons in the 4th shell

answer => Arsenic i.e As