Atomic structure exam q

Question 1

State two features of the current model that are not shown in the Rutherford model.

Answer 1

doesnt show neutrons and protons
current model shows electrons in different energy levels

Question 2

In a time of flight mass spectrometer, molecule X is ionised using electrospray
ionisation.
What is the equation for this ionisation?
A X(l) + e– → X+
(g) + 2 e–
B X(g) + e– → X+
(g) + 2 e–
C X(l) + H+ → XH+ (g)
D X(g) + H+ → XH+
(g)

Answer 2

D

Question 3

What is the electron configuration of V2+ in the ground state?
A 1s2 2s2 2p6 3s2 3p6 3d3
B 1s2 2s2 2p6 3s2 3p6 3d1 4s2
C 1s2 2s2 2p6 3s2 3p6 3d3 4s2
D 1s2 2s2 2p6 3s2 3p6 3d5 4s2

Answer 3

A

Question 4

Give two reasons why ionisation is needed before they can be analysed in tof

Answer 4

• so ions can be accelerated by a negative plate/ electric field
• ions generate a current when they hit the detector

Question 5

Which is the electron configuration of an atom with only two unpaired electrons?
A 1s2 2s2 2p3
B 1s2 2s2 2p4

Answer 5

B

Question 6

Which shows the electron configuration of an atom of a transition metal?
A [Ar] 4s23d0
B [Ar] 4s23d8
C [Ar] 4s23d10
D [Ar] 4s23d104p1

Answer 6

B

Question 7

vState how, if at all, the chemical properties of these isotopes differ.
Give a reason for your answer.

Answer 7

doesnt change
has the same number of outer electrons