Answer:
Almost every element has at least one use. So
Hydrogen- Sun and Stars
Helium- Balloons
Lithium- Batteries
Beryllium- Emeralds
Boron- Sports Equipment
Carbon- Basics Of Life's Molecules
Nitrogen- Protein
Oxygen- Air
Fluorine- Toothpaste
Neon- Red Neon Lights
Sodium- Salt
Magnesium- Chlorophyll
Aluminium- Airplanes
Silicon- Stone, Sand and Soil
Phosphorus- Fertilizer
Sulfur- Manufacture of Sulfuric Acid
Chlorine- Pool Water
Argon- Blue Neon Lights
Potassium- Fruits and Vegetables
Calcium- Shells and Bones
Scandium- Bicycle Frames
Titanium- Aerospace
Vanadium- Bed Springs
Chromium- Stainless Steel
Manganese- Earthmovers
Iron- Steel Structures
Cobalt- Magnets
Nickel- Coins
Copper- Electric Wires
Zinc- Brass
Gallium- LED lights
Germanium- Semi-Conductor Electronics
Arsenic- Poison
Selenium- Photocopiers
Bromine- Photographic Film
Krypton- Flashlights
Rubidium- Global Navigation
Strontium- Fireworks
Yttrium- Lasers
Zirconium- Chemical Pipelines
Niobium- Mag Lev Trains
Molybdenum- Cutting Tools
Technetium- Radioactive Diagnosis
Ruthenium- Electric Switches
Rhodium- Searchlight Reflectors
Palladium- Pollution control
Silver- Small Jewellry
Cadmium- Paint
Indium- LCDs
Tin- Plated Food Cans
Antimony- Car Batteries
Tellurium- Thermoelectric Coolers
Iodine- Disinfectent
Xenon- High-Intensity Lamps
Caesium- Atomic Clocks
Barium- X-Ray Diagnosis
Lanthanum- Telescope Lenses
Cerium- Lighter Flints
Praseodymium- Torchworker's Eyeglasses
Neodymium- Big Electric Motor Magnets
Promethium- Luminous Dials
Samarium- Small Electric Motor Magnets
Europium- Coloured Televisions
Gadolinium- MRI Diagnosis
Terbium- Fluorescent Lamps
Dysprosium- Smart Material Actuators
Holmium- Laser Body Surgery
Erbium- Optical Fibre Communications
Thulium- Laser Eye Surgery
Ytterbium- Scientific Fibre Lasers
Lutetium- Photodynamic Medicine
Hafnium- Nuclear Submarines
Tantalum- Cellphones
Tungsten- Lightbulb Filaments
Rhenium- Rocket Engines
Osmium- Pen Points
Iridium- Spark Plugs
Platinum- Labware
Gold- Big Jewellry
Mercury- Thermometers
Thallium- Rat Poisoning
Lead- Weights
Bismith- Fire Sprinklers
Polonium- Anti-Static Brushes
Astatine- Radioactive Medicine Cleaners
Radon- Surgical Implants
Francium- Laser Atom Traps
Radium- Luminous Watches
Actinium- Radioactive Medicine
Thorium- Gas Lamp Mantles
Proactinium- NO USES
Uranium- Nuclear Energy
Neptunium- Small Nuclear Weapons
Plutonium- Big Nuclear Weapons
Americium- Smoke Detectors
Curium- Mineral Analyzers
Berkelium- NO USES
Californium- Metal Detectors
Einsteinium- Small Hydrogen Bombs
Fermium- Large Hydrogen Bombs
Mendelevium- NO USES
Nobelium- NO USES
Lawrencium- NO USES
These are just the first 103 elements. Rutherfordium and the other transactinide metals have no uses (they wouldn't last long enough to put to good use anyway