Interactive Periodic Table
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The periodic table arranges the 118 known elements by atomic number (the number of protons). Elements in the same column, or group, behave alike: the group 1 alkali metals all react strongly with water, and the group 18 noble gases barely react at all.
How to read the periodic table
- Atomic number (top) is the number of protons and sets the element’s identity.
- Atomic mass is the average mass of its atoms in unified atomic mass units (u), which is also grams per mole.
- Periods are rows (1 to 7); groups are columns (1 to 18).
- The two rows at the bottom, the lanthanides and actinides, belong in period 6 and 7; they are shown separately to keep the table narrow.
Metals, nonmetals and metalloids
Most elements are metals, on the left and in the middle. Nonmetals sit at the upper right, with the noble gases in the last column. Metalloids such as silicon and germanium lie along the staircase between them and have properties of both.
Using it for chemistry math
Molar mass comes straight from the table: water, H₂O, has 2 × 1.008 + 15.999 ≈ 18.015 g/mol. Divide a mass by the molar mass to get moles; the element panel shows how many moles are in 100 g of each element.
Interactive Periodic Table quiz: 10 questions
Test yourself with 10 multiple-choice questions. Choose an answer and press Submit to see if you are right and why. Your score appears at the end.
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Frequently asked questions
How many elements are on the periodic table?
118, from hydrogen (1) to oganesson (118).
Where do the atomic masses come from?
Standard atomic weights from IUPAC, rounded conventionally; for radioactive elements, the mass number of the longest-lived isotope.
Why are two rows separate at the bottom?
The lanthanides and actinides would make the table very wide, so they are shown below.
What do the colors mean?
They show the category: alkali metals, transition metals, noble gases and so on. Tap a category to highlight it.
Can I use it to find molar mass?
Yes, or use the molar mass calculator for whole formulas.
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