A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

actinium

Definition

Actinium is a chemical element with the symbol Ac and the atomic number 89. It is a radioactive element that is not found naturally on Earth. Actinium is the first member of the actinide series, which is a group of elements that are all radioactive.

Actinium is a silvery-white, radioactive metal that is very reactive. It is a member of the actinide group, which is a group of elements that are very reactive and combine easily with other elements. Actinium is also a radioactive element, which means that it breaks down over time and emits radiation.

Actinium was first discovered in 1899 by Pierre and Marie Curie. The element was named after the Greek word "aktinos," which means "ray."

Actinium is not used for any practical purposes. However, it is a valuable research tool for scientists who study nuclear physics.

Here is a fun fact about actinium:

  • Actinium is so radioactive that it has a half-life of only 21.7 years. This means that half of a sample of actinium will decay into other elements in 21.7 years.

How can the word be used?

Actinium is a silvery-white, radioactive metal that is very reactive.

actinium

Different forms of the word

Noun:

actinium (no plural form).

a chemical element with the symbol Ac and atomic number 89.

Adjective:

  • actinium.
  • relating to or containing actinium.

Verb:

  • actinize.
  • to expose to actinium radiation.

Etymology

The word actinium comes from the Greek word "aktis", which means "ray". It was named after this because actinium emits alpha particles, which are a type of radiation.

Question

What is actinium?

Stay connected

Join our newsletter to stay up to date on features and releases

Address
Developing Experts Limited
Exchange Street Buildings
35-37 Exchange Street
Norwich
NR2 1DP
UK

Phone
01603 273515

Email
hello@developingexperts.com

Copyright 2025 Developing Experts, All rights reserved.