Dubnium

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/dubnium

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. Who discovered Dubnium?Claims made in 1968 (JINR) and 1970 (LBL), officially resolved in 1993
2. What is the symbol?Db
3. What is the atomic number?105
4. Where was dubnium first discovered?Scientists at the Joint Institute for Nuclear Research in Dubna, Russia, first reported making dubnium in 1968. In 1970, scientists at Lawrence Berkeley Laboratory in the United States also claimed to have made it.
5. How long does dubnium last before it decays?The most stable form, dubnium‑268, has a half‑life of about 16 hours, meaning after 16 hours half of the atoms have decayed.

Superheavy Element: Elements with atomic numbers greater than 103, typically synthesized artificially.
Relativistic Effects: Changes in electron behavior and atomic properties due to speeds approaching the speed of light.
Island of Stability: A theoretical region where certain superheavy isotopes are predicted to have much longer half-lives.