Mod 2A: ElectronsRE Test/27%

1)This question is about two elements, A and B, in the periodic table.

a)Each atom of element A has 16 electrons.

i)Identify element A.[1]

ii)Complete the electronic configuration of A.[1]

1s2 …….

iii)Predict the charge on an ion of A and complete its electronic configuration.[2]

Charge on ion ______electronic configuration of ion of A 1s2 …..

b)Element B exists as a mixture of three isotopes.

The atoms of element B have five electrons in the 3d sub – shell. Identify element B.[1]

c)How many orbitals does the 3d sub shell have? [1]

d)What is meant by the term orbital? [3]

2)The Group 7 element chlorine is obtained from the electrolysis of brine. It is used in bleaches and disinfectants.

a)The electronic configuration of a chlorine atom can be written in terms of sub – shells.

i)Complete the electronic configuration of a chlorine atom. [2]

1s22s22p6 ……

ii)Why is chlorine classified as a p – block element? [1]

3)The first six ionisation energies of an element D are shown in the table.

1st / 2nd / 3rd / 4th / 5th / 6th
1086 / 2353 / 4621 / 6223 / 37832 / 47278

a)Define the term first ionisation energy. [3]

b)Write an equation, including state symbols, to represent the second ionisation energy of element D.[2]

c)Use the table to deduce which group of the Periodic Table contains element D.[3]

Group ______

Explanation

4)This question is about gallium oxide, Ga2O3.

a)Successive ionisation energies provide evidence for the arrangement of electrons in atoms. The graph below shows the 8 successive ionisation energies for oxygen.

i)Write an equation, including state symbols, to represent the fourthionisation energy of oxygen. [2]

ii)How does the graph provide evidence for the existence of two electron shells in oxygen? [2]

b)i)Complete the electronic configuration for agallium atom. [1]

1s2……..

ii)Sketch a graph to show the five successive ionisation energies of gallium. [2]