Mendeleev's predicted elements

High school (ages 12+)
Science & Technology

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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/mendeleev-s-predicted-elements

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. How heavy is Mendeleev's predicted elements?Eka-boron (~44), Eka-aluminium (~68), Eka-silicon (~72)
2. What is the discoverer of periodic table?Dmitri Mendeleev
3. What is the year of periodic table publication?1869
4. What were Mendeleev’s "eka" elements?Mendeleev guessed there were missing elements below boron, aluminium, and silicon. He called them eka-boron, eka-aluminium, and eka-silicon.
5. How did Mendeleev predict the properties of these elements?He looked at patterns in the periodic table and estimated their atomic mass, density, melting point, and reactivity based on nearby elements.

Periodic Law: The principle that the chemical properties of elements recur periodically when arranged by atomic weight.
Atomic Weight: The average mass of atoms of an element, expressed in atomic mass units.
Empirical Vindication: Proof of a theory or prediction through observation and experimentation.
Semiconductors: Materials used in electronic devices that conduct electricity under certain conditions.