Background for actinides
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actinides

/ˈæktɪnaɪdz/

Meanings
noun
Any of the 14 radioactive elements of the periodic table that are positioned under the lanthanides, to which they have similar chemistry.

Examples :

"My chemistry textbook explains that the actinides are a series of radioactive elements, including uranium and plutonium, located below the lanthanides on the periodic table. "
element chemistry science

Related Words

Illustration including

including verb

/ɪnˈkluːdɪŋ/

To bring into a group, class, set, or total as a (new) part or member.

"I will purchase the vacation package if you will include car rental."

Illustration textbook

textbook noun

/ˈtɛkst.bʊk/

A coursebook, a formal manual of instruction in a specific subject, especially one for use in schools or colleges.

"My math teacher recommended a specific textbook for extra practice. "

Illustration plutonium

plutonium noun

/pluːˈtoʊniəm/

A sanctuary dedicated to the Ancient Greek and Roman god Pluto, usually at a location producing poisonous emissions, believed to represent an entrance to the underworld.

"The ancient city's plutonium, a temple to Pluto, was said to be haunted by strange, foul odors. "

Illustration radioactive

radioactive noun

/ˌɹeɪdioʊˈaktɪv/ /ˌɹeɪdioʊˈæktɪv/

Any radioactive substance.

"The radioactive was carefully stored in a lead-lined container at the science lab. "

Illustration lanthanides

lanthanides noun

/ˈlænθənaɪdz/

Any of the 14 rare earth elements from cerium (or from lanthanum) to lutetium in the periodic table; because their outermost orbitals are empty, they have very similar chemistry; below them are the actinides.

"Chemists studying the properties of the lanthanides group them together because these elements behave similarly in chemical reactions. "

Illustration explains

explains verb

/ɪkˈspleɪnz/ /ɛkˈspleɪnz/

To make plain, manifest, or intelligible; to clear of obscurity; to illustrate the meaning of.

"To explain a chapter of the Bible."

Illustration chemistry

chemistry noun

/ˈkɛm.ɪ.stɹi/

The branch of natural science that deals with the composition and constitution of substances and the changes that they undergo as a consequence of alterations in the constitution of their molecules.

"The chemistry class focused on how different elements combine to form new substances. "

Illustration positioned

positioned verb

/pəˈzɪʃənd/ /pəˈzɪʃənd/

To put into place.

"The teacher positioned the globe on the table so the students could see it easily. "

Illustration periodic

periodic adjective

/ˌpɪə-/ /ˌpɪɹiˈɑdɪk/ /ˌpɜːɹaɪˈɒdɪk/

Relative to a period or periods.

"My doctor recommended periodic checkups for good health. "

Illustration elements

elements noun

/ˈel.ɪ.mənts/

One of the simplest or essential parts or principles of which anything consists, or upon which the constitution or fundamental powers of anything are based.

"Letters are the elements of written language."

Illustration similar

similar noun

/ˈsɪmələ/ /ˈsɪməlɚ/

That which is similar to, or resembles, something else, as in quality, form, etc.

"The teacher praised the students' similar answers on the math quiz. "

Illustration uranium

uranium noun

/jʊˈɹeɪniəm/

The element with atomic number 92 and symbol U: a radioactive silvery-grey metal in the actinide series.

"Nuclear power plants use uranium to generate electricity. "