The goal of this project is to provide a user-friendly way to access information about chemical elements from the periodic table. The script connects to a periodic table database, fixes errors, and adds constraints and extra chemical element information. It then uses the Bash programming language to retrieve the requested element information and output it to the user.
To use this script, you'll need to have Bash installed on your computer. Once you have that, simply run the script with an argument in the form of an atomic number, symbol, or name of an element. For example:
./periodic_table.sh 8
This will retrieve information about Oxygen, the element with an atomic number of 8.
If you're not sure what argument to use, you can simply run the script without an argument and it will prompt you to provide one:
./periodic_table.sh
The script outputs information about the selected element in the following format:
The element with atomic number [atomic number] is [name] ([symbol]). It's a [type], with a mass of [atomic mass] amu. [name] has a melting point of [melting point] celsius and a boiling point of [boiling point] celsius.
For example, if you search for Oxygen, the output will look like this:
The element with atomic number 8 is Oxygen (O). It's a Nonmetal, with a mass of 15.999 amu. Oxygen has a melting point of -218.79 celsius and a boiling point of -182.962 celsius.
The script connects to a PostgreSQL database with the following credentials:
- Username: freecodecamp
- Database name: periodic_table
The database contains information about 118 chemical elements from the periodic table.
#!/bin/bash
# Create a PSQL variable to query the periodic table database
PSQL="psql -x --username=freecodecamp --dbname=periodic_table --tuples-only -c"
# Check if an element is provided as an argument
if [[ -z $1 ]]
then
# If no element is provided, ask the user to provide one
echo "Please provide an element as an argument."
else
# If an element is provided
bash
Copy code
# Check if it is not a number
if [[ ! $1 =~ ^[0-9]+$ ]]
then
# Search the element by name or symbol
GET_ELEMENT_SELECTED=$($PSQL "SELECT atomic_number, name, symbol, type, atomic_mass, melting_point_celsius, boiling_point_celsius FROM elements INNER JOIN properties USING(atomic_number) INNER JOIN types USING(type_id) WHERE symbol ILIKE '$1' OR name ILIKE '$1'")
else
# Search the element by atomic_number
GET_ELEMENT_SELECTED=$($PSQL "SELECT atomic_number, name, symbol, type, atomic_mass, melting_point_celsius, boiling_point_celsius FROM elements INNER JOIN properties USING(atomic_number)INNER JOIN types USING(type_id) WHERE atomic_number=$1")
fi
# Check if the element is not found
if [[ -z $GET_ELEMENT_SELECTED ]]
then
# If the element is not found, inform the user
echo "I could not find that element in the database."
else
# If the element is found, output its information
echo $GET_ELEMENT_SELECTED | while read COL BAR ATOMIC_NUMBER COL BAR NAME COL BAR SYMBOL COL BAR TYPE COL BAR ATOMIC_MASS COL BAR MELTING_POINT COL BAR BOILING_POINT
do
echo "The element with atomic number $ATOMIC_NUMBER is $NAME ($SYMBOL). It's a $TYPE, with a mass of $ATOMIC_MASS amu. $NAME has a melting point of $MELTING_POINT celsius and a boiling point of $BOILING_POINT celsius."
done
fi
fi
