Everything Science Grade 10

CHAPTER 5. THE PERIODIC TABLE 5.2

Z Name of element Ionization energy Z Name of element Ionization energy

1 1310 10 2072

2 2360 11 494

3 517 12 734

4 895 13 575

5 797 14 783

6 1087 15 1051

7 1397 16 994

8 1307 17 1250

9 1673 18 1540

a. Fill in the names of the elements.

b. Draw a line graph to show the relationship between atomic number

(on the x-axis) and ionisation energy (y-axis).

c. Describe any trends that you observe.

d. Explain why:

i. the ionisation energy forZ= 2is higher than forZ= 1

ii. the ionisation energy forZ= 3is lower than forZ= 2

iii. the ionisation energy increases betweenZ= 5andZ= 7

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(1.) 001p (2.) 001q

Chemical properties of

the groups

ESABP

In some groups, the elements display very similar chemical properties and some of the

groups are even given special names to identify them. The characteristics of each group are

mostly determined by the electron configuration of the atoms of the elements in the group.

The names of the groups are summarised in Figure 5.3

Chemistry: Matter and materials 99