The atomic structure of an unknown element is shown below.
What is the atomic number and mass number for the unknown element?
Atomic Number | Mass Number | |||
☐ | A | 6 | 11 | |
☐ | B | 5 | 11 | |
☐ | C | 5 | 6 | |
☐ | D | 6 | 10 |
Did this page help you?
The atomic structure of an unknown element is shown below.
What is the atomic number and mass number for the unknown element?
Atomic Number | Mass Number | |||
☐ | A | 6 | 11 | |
☐ | B | 5 | 11 | |
☐ | C | 5 | 6 | |
☐ | D | 6 | 10 |
Did this page help you?
Atoms contain electrons, neutrons and protons.
☐ | A | 0 | |
☐ | B | ||
☐ | C | 1 | |
☐ | D | -1 |
Argon is in group 0 of the periodic table.
Identify, using the periodic table, which of these elements is in the same period as argon.
☐ | A | bromine | |
☐ | B | iron | |
☐ | C | magnesium | |
☐ | D | xenon |
Figure 4 shows the atomic number and mass number of two isotopes of argon.
isotope | atomic number | mass number |
argon-38 | 18 | 38 |
argon-40 | 18 | 40 |
Figure 4
Describe the structure of an atom of argon-38 and of an atom of argon-40.
Did this page help you?
As the atomic model developed, protons, neutrons and electrons were discovered.
What was the correct order of discovery?
First | Second | Third | |||
☐ | A | Proton | Neutron | Electron | |
☐ | B | Proton | Electron | Neutron | |
☐ | C | Electron | Proton | Neutron | |
☐ | D | Electron | Neutron | Proton |
Did this page help you?
Chlorine has an atomic number of 17.
Figure 3 shows the arrangement of electrons in an atom of chlorine.
Figure 3
☐ | A | 10.7 | |
☐ | B | 17 | |
☐ | C | 2.8.7 | |
☐ | D | 7.8.2 |
The nucleus of an atom is made up of protons and neutrons.
Atoms of chlorine contain 17 protons.
Figure 4 shows some information about a proton, a neutron and an electron.
relative mass | relative charge | |
proton | 1 | +1 |
neutron | 1 | 0 |
electron | very small | -1 |
Figure 4
(2)
(1)
number of neutrons = .................................................
(2)
Did this page help you?
Chlorine–35 and chlorine–37 are isotopes.
Which statement describes an isotope?
☐ | A | Atoms with the same number of protons and different numbers of electrons | |
☐ | B | Atoms with the same number of neutrons and different numbers of electrons | |
☐ | C | Atoms with the same number of protons and different numbers of neutrons | |
☐ | D | Atoms with the same number of neutrons and different numbers of protons |
Did this page help you?
Titanium and iron are examples of transition metals.
Figure 6 shows the percentage abundance of each isotope in a sample of titanium.
Figure 6
Calculate the relative atomic mass of titanium in this sample.
relative atomic mass = ......................................
Iron, when heated in air, reacts with oxygen to form iron oxide.
☐ | A | crystallisation | |
☐ | B | distillation | |
☐ | C | neutralisation | |
☐ | D | oxidation |
Describe how the equipment shown in Figure 7 could be used to find the mass of oxygen that combines with 0.500 g of iron wool in a crucible and lid of known mass.
(3)
2.24 g of iron combines with 0.96 g of oxygen to form an oxide of iron.
Determine the formula of this oxide of iron and use it to complete the balanced equation.
(relative atomic masses: Fe = 56.0, O = 16.0)
You must show your working.
balanced equation for the reaction is
................ Fe + ................O2 → ................................................
Did this page help you?