reactive nonmetals

H

Hydrogen (1)
🔴 Highly flammable gas; key component of water and fuels.

C

Carbon (6)
🔴 Forms the backbone of all organic life; can bond in many ways.

N

Nitrogen (7)
🔴 Makes up 78% of Earth's atmosphere; vital for proteins and DNA.

O

Oxygen (8)
🔴 Essential for respiration; supports combustion; part of water.

F

Fluorine (9)
🔴 Most reactive element; used in toothpaste and Teflon.

P

Phosphorus (15)
🔴 Essential for DNA and energy transfer (ATP); used in fertilizers.

S

Sulfur (16)
🔴 Found in proteins; used in vulcanized rubber and sulfuric acid.

Cl

Chlorine (17)
🔴 Used in disinfectants and water treatment; very reactive.

Se

Selenium (34)
🔴 Trace nutrient; used in electronics and glassmaking.

Br

Bromine (35)
🔴 Liquid at room temp; used in flame retardants and some meds.

I

Iodine (53)
🔴 Needed for thyroid health; used as an antiseptic.

At

Astatine (85)
🔴 Extremely rare and radioactive; likely behaves like iodine.