Self assessment
Question 1 of 4
A bromine atom has 35 electrons. Which of the following answers are correct descriptions of its electronic configuration?
A
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5
B
[Kr] -1
C
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p7
D
[Ar] 3d10 4s2 4p5
How many 2p orbitals are there?
A
1
B
2
C
3
D
5
Which statement is the best definition of an orbital?
A
An orbital shows the movement of the electron around the nucleus.
B
An orbital is a region in space in which we find an electron.
C
An orbital shows the pull of the nucleus in different directions.
D
An orbital is a region of space in which there is 90% chance of locating an electron.
The electron configuration of scandium is [Ar] 3d1 4s2. What is the electronic configuration of Sc2+?
A
[Ar] 3d1 4s0
B
[Ar] 3d0 4s1
C
[Ar] 3d1 4s1
D
[Ar] 3d0 4s2