Library›Atomic Numbers and Elements›One card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

ScienceOne small ahaElement

This chemical element has atomic number 72.

Think it. Then flip it. ahamoraTap to reveal Back to the cue
ScienceOne small aha
Your new ahaHafnium

Hafnium has 72 protons in every atomic nucleus. Changing that number would make a different element. Source: Hafnium ↗

ahamoraReference ↗

Keep the thread going

One answer is a beginning.

Share a little curiosity, or follow it into the full collection.

Flip the full deck →

More from Atomic Numbers and Elements

A few more worth knowing.

  1. 73This chemical element has atomic number 73.RECALL
    Tantalum

    Symbol Ta

    Open this card ↗
  2. 74This chemical element has atomic number 74.RECALL
    Tungsten

    Symbol W

    Open this card ↗
  3. 75This chemical element has atomic number 75.RECALL
    Rhenium

    Symbol Re

    Open this card ↗