🧪 1. Hydrogen (H)

🧠 Basic Info:

• Symbol: H

• Atomic number: 1

• Color: Colorless

• Gas: Yes

• Flammable: 💥 YES – super explosive

Cool Facts:

• It's the lightest element in the universe.

• Makes up 75% of the universe’s mass.

• Was made just after the Big Bang.

• Used in stars – including the Sun – to create energy via nuclear fusion.

Uses:

• Rocket fuel (mixed with oxygen).

• Making ammonia (for fertilizers).

• In hydrogen fuel cells (clean energy cars).

2. Helium (He)

Basic Info:

• Symbol: He

• Atomic number: 2

• Color: Colorless

• Gas: Yes

• Flammable: ❌ Nope

Cool Facts:

• Second lightest element.

• Inert gas – doesn’t react with anything.

• Found in space and stars.

• You sound like a chipmunk after inhaling it – BUT DON’T TRY THAT. It’s dangerous!

Uses:

• Filling balloons and airships (lighter than air).

• Cooling superconductors & MRI machines.

• Space tech – used to pressurize fuel tanks.

3. Oxygen (O)

Basic Info:

• Symbol: O

• Atomic number: 8

• Color: Colorless

• Gas: Yes

• Flammable: ❌ But makes other things burn faster!

Cool Facts:

• Makes up 21% of Earth’s air.

• Needed by humans and animals to breathe.

• Plants give us oxygen via photosynthesis.

• In water (H₂O = 2 hydrogen + 1 oxygen).

Uses:

• Breathing (oxygen tanks, hospitals).

• Welding & cutting metals.

• Rocket fuel oxidizer.

• Making steel, plastics, and textiles.