Ionisation Energy

Which is the correct equation for the first ionisation energy for magnesium ?

• A

• B

• C

• D

Why is the second ionisation energy of magnesium higher than the first ionisation energy?

• Less shielding

• Ionic radius increases

• Nuclear charge is increasing

• Greater attraction between positive nucleus and outer electron

Which statement does not explain the increase in ionisation energy across a period?

• Nuclear charge increases

• Atomic radius decreases

• Shielding remains constant

• Number of electrons increase

The second ionisation energy of magnesium is 1451 kJ/mol . Which equation correctly represents this statement?

• A

• B

• C

• D

Which of the following statements describes first ionisation energy?

• A

• B

• C

• D

The first five ionisation energies of an element are shown below. What element could this ionisation energy graph belong to?

• N

• P

• Al

• Na

The successive ionisation energies of element X are shown in the table below. Which group of the periodic table does element X belong to?

• 3

• 4

• 5

• 6

Successive ionisation energies for an element, Y, are shown in the table below. What is the most likely formula for the ion of Y?

• Y+

• Y 2+

• Y 3+

• Y 4+

X, Y and Z are consecutive elements in the third Period of the Periodic Table. Element Y has the highest first ionisation energy and also the lowest melting point of these three elements. What could be the identities of X, Y and Z?

• silicon, phosphorus, sulfur

• sodium, magnesium, aluminium

• aluminium, silicon, phosphorus

• magnesium, aluminium, silicon

Values for the successive ionisation energies for an unknown element are given in the table below. In which group of the periodic table would the unknown element be found?

• 1

• 2

• 13

• 14