The Group 2 elements show metallic bonding.

1. (a)Define metallic bonding. [2][2]
2. (b)The Group 2 elements form stable 2+ cations.
3. (b)(i)State and explain the variation in ionic radius of the Group 2 elements down the group. [2][2]
4. (b)(ii)Table 2.1 shows successive ionisation energy values for beryllium, Be. Table 2.1 ionisation energy/kJmol–1 | 1st | 2nd | 3rd | 4th ---|---|---|---|--- | 900 | 1760 | 14800 | 21000 Use Table 2.1 to state and explain: • the general trend in these values • the significance of the large difference between the 2nd and 3rd ionisation energies. [2][2]
5. (c)All the Group 2 elements except beryllium have more than one stable isotope. (i) Beryllium exists as the single isotope ⁹₄Be. Describe the distribution of mass within an atom of ⁹₄Be. [2][2]
6. (c)(ii)Complete Table 2.2 to show the numbers of protons and neutrons in the isotopes of magnesium. Table 2.2 isotope | number of protons | number of neutrons ---|---|--- magnesium-24 | | magnesium-25 | | magnesium-26 | | [2][2]
7. (c)(iii)[Figure 2.1] shows the behaviour of a beam of protons in an electric field. Complete [Figure 2.1] to show the behaviour of separate beams of neutrons and electrons in the same electric field. Label your diagram clearly. Assume that the beams of each particle are moving at the same velocity. [Figure 2.1] [3][3]
8. (d)(i)State what is observed when dilute hydrochloric acid is added to separate samples of barium oxide and barium carbonate. barium oxide barium carbonate [2][2]
9. (d)(ii)Write an equation for the reaction of strontium, Sr, with an excess of cold water. [1][1]
10. (d)(iii)State the variation in solubility of the Group 2 sulfates down the group. [1][1]

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