Page 71 - Science Coursebook

4 End of unit questions

4.2 Many scientists contributed to the model of the atom that is shown in the diagram below.
a Copy the diagram and label it using the following words:
electron nucleus proton neutron

[4]
Name the particle that:
b has a positive charge [1]
c has no charge [1]
d has the least mass [1]
e is present in the same numbers as the protons in an atom. [1]

4.3 a Neon is a noble gas. It has the electronic structure 2,8.
Which of the diagrams, A, B, C or D, shows the electronic structure of neon?

A B C D

[1]
b How many protons does the atom of neon have? [1]

Neon is in Group 8 of the Periodic Table. Other gases in this group are helium
and argon.
c The elements in Group 8 are sometimes called the noble or inert gases.
Helium has only one shell of electrons, neon has two and argon has three.
What do the shells of this group have in common? [1]
d How are elements in Group 8 different from all other elements in the
Periodic Table? [1]

4 Material properties 69