Chemistry Elements

noun a regular feature or section of a newspaper or magazine

• The data was organized neatly in a column for easy reference.
• I always jot down my notes in the left column of my notebook.
• Check out the gossip column in the newspaper for the latest news.
• She stood tall and proud, like a column of strength in the face of adversity.

adjective subject to sudden or unpredictable changes of mood or mind

• His mercurial temperament made it difficult to predict his reactions in a professional setting.
• She's so mercurial, one minute she's happy and the next she's upset.
• I can't keep up with his mercurial moods, it's like he's always changing his mind.
• The stock market can be mercurial, fluctuating wildly from one day to the next.

adjective describing something that has the properties of metal, such as being shiny, hard, and able to conduct electricity

• The metallic taste in the water is likely due to high levels of iron.
• I don't like the metallic flavor of canned food.
• That car has a cool metallic paint job.
• Her voice had a metallic edge to it, indicating her frustration.

noun a word used to identify any of a class of people, places, or things

verb a word used to describe an action, state, or occurrence

adjective a word that describes or modifies a noun or pronoun

adverb a word that modifies or qualifies an adjective, verb, or other adverb

pronoun a word that can function by itself as a noun phrase and that refers either to the participants in the discourse or to someone or something mentioned elsewhere in the discourse

preposition a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause

conjunction a word used to connect clauses or sentences or to coordinate words in the same clause

interjection a word or phrase that expresses a strong emotion

• X marks the spot where the treasure is buried.
• Hey, can you show me where X is on the map?
• I heard there's some good stuff hidden at X.
• In this equation, X represents the unknown variable.

noun a group or set of four

• A tetrad is a group of four similar things or people.
• We formed a tetrad to work on the project together.
• Let's make a tetrad and hang out this weekend.
• The four seasons can be seen as a natural tetrad in the cycle of life.