Copy of 2.) Radioactivity Video (5/28/2026)

Marie Curie proposed the word to define this new property of matter.

In , Marie Curie made two startling discoveries in a single week.

Marie tested and found it could make air a better conductor, which was an early sign of behavior beyond uranium.

Marie’s key insight was that radioactivity wasn’t just unique to element; it seemed to be a broader property of .

When Marie tested pitch blend, it was far more radioactive than .

The Curies checked their measurements repeatedly and concluded the result was real.

Because pitch blend produced intense radioactivity, Marie and Pierre suspected there must be a present in tiny amounts.

Marie Curie named the first newly identified radioactive element .

Marie Curie’s second radioactive element was a more active than even her uranium sample.

Marie Curie used to identify materials, looking for new spectral evidence indicating a genuinely new element.

Marie Curie’s samples needed to be pure enough that they could be isolated and confirmed as a distinct radioactive element.

In 1902, after processing huge quantities of pitch blend residue, Marie Curie isolated of radium chloride from of residue.

Marie Curie determined radium’s atomic weight, supporting that a radioactive element has measurable .

After these discoveries, it became clear that radioactivity implied the atom itself could be and .

Marie Curie’s work created a new method for by tracking their radioactive power/activity.