Periodic table
Find an element in the periodic table.
In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in his periodic table for them.
Make
Write a program that allows the user to enter the symbol or name of an element. The program outputs the name of the element, the atomic weight and the group of elements it belongs to using the data in the table below.
Use this boilerplate code as a starting point:
Success Criteria
Remember to add a comment before a subprogram or selection statement to explain its purpose.
Create a subprogram called `periodic_table` that:
- Takes a parameter that is the symbol or name of an element in the periodic table. E.g. Li is Lithium.
- Ouputs the symbol of the element.
- Outputs the name of the element.
- Outputs the atomic weight of the element.
- Outputs the group the element belongs to.
- Ouputs "Element is not in the catalogue" if the data is not in the program.
- Uses the data below for the subprogram:
Symbol | Element | Atomic weight | Group |
|---|---|---|---|
Li | Lithium | 6.94 | Alkali metals |
Na | Sodium | 22.99 | Alkali metals |
K | Potassium | 39.098 | Alkali metals |
F | Fluorine | 18.998 | Halogens |
Cl | Chlorine | 35.45 | Halogens |
Br | Bromine | 79.904 | Halogens |
Complete the `main program` so that:
- The user can input the symbol or name of an element.
- It calls the `periodic_table` subprogram to output the relevant data.
Typical inputs and outputs from the program would be:
Enter the symbol or name of an element: K
Element: Potassium
Atomic weight: 39.098
Group: Alkali metals
Enter the symbol or name of an element: Clorine
Element: Chlorine
Atomic weight: 35.45
Group: Halogens
Knowledge Organiser
Use these resources as a reference to help you meet the success criteria.
Programming guide:
Flowcharts:
Parsons:
Evaluate
Run the unit tests below to check that your program has met the success criteria.
Enter the symbol or name of an element: K
Element: Potassium
Atomic weight: 39.098
Group: Alkali metals
Enter the symbol or name of an element: Clorine
Element: Chlorine
Atomic weight: 35.45
Group: Halogens
Check that you have:
- Used comments within the code to describe the purpose of subprograms and conditions.
- Used meaningful identifier names. That means the names of subprograms and variables indicate what they are for.
