PERIODIC TABLE OF QR-CODES

KRYPTON

• Not very reactive
• Reacts only with Fluorine
• Can be used in lasers

THORIUM

• If heated, burns very intensely
• Component in a camera lens
• High reflective index/ low dispersion

SODIUM

• Very reactive
• Very soft
• Very shiny
• Dropping sodium in water reacts explosively

BERYLLIUM

• Toxic
• Transparent to X-rays
• Very expensive

PHOSPHORUS

• Burns very easily
• Used in bombs
• Used in matches
• A human synthesizes nearly 70 kg of this in a day

ARSENIC

• Used as a pigment in green wallpaper in the 19th century
• Very toxic
• Used in technology

MERCURY

• Liquid metal at room temp.
• Very dense and poisonous
• Was used in barometers and thermometers