Periodic table

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/periodic-table

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. What is the predictive framework?The table enables prediction of elemental properties and reactivity based on position
2. What is the historical development?Evolved from Mendeleev's empirical observations to a quantum mechanical explanation
3. Why did Mendeleev create the Periodic Table?He organized elements by mass and noticed repeating properties, leaving blanks for missing ones he later predicted.
4. How does the Periodic Table show patterns?Elements in the same column (group) have the same number of outer electrons, so they act similarly, and trends like size and energy change across rows and down columns.

Atomic Number: The count of protons in an atom's nucleus, uniquely identifying an element.
Electron Configuration: The arrangement of electrons within an atom's energy levels and orbitals.
Valence Electrons: Electrons in the outermost shell of an atom, responsible for chemical bonding.
Periodic Law: The principle that the physical and chemical properties of elements are periodic functions of their atomic numbers.