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# strontium

noun (strontium, uncountable)

«strontium» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. Strontium is a soft, silvery metal, a chemical element with the symbol Sr and atomic number 38. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/strontium/#m1)
2. Strontium compounds give fireworks and flares a bright red colour. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/strontium/#m2)

### In the lessons

In science lessons on elements and the periodic table it is in the same group as calcium and magnesium. Fireworks are a fun example: strontium makes red, copper makes blue, barium makes green, sodium makes yellow. It is named after Strontian, a village in Scotland where it was found. A radioactive kind, strontium-90, is dangerous and was released by nuclear tests and accidents. Phrases: «strontium salts», «strontium-90».

### Examples

- Strontium makes fireworks burn bright red. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/strontium/#x1)
- The symbol for strontium is Sr. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/strontium/#x2)
- Strontium was named after a village in Scotland. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/strontium/#x3)
- Strontium is a metal in the same group as calcium. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/strontium/#x4)
- Red emergency flares contain strontium. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/strontium/#x5)
- Strontium-90 is a dangerous radioactive form. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/strontium/#x6)

### Note

Uncountable. Said «STRON-tee-um» or «STRON-shum». Chemical symbol Sr with a small r. Ordinary strontium is not radioactive; only some kinds (isotopes) are.

## On Mova

- [Trees and pragmatics of «strontium» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/strontium/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«strontium» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/strontium.html) on Mova free.