<!-- wp:paragraph --> <p><strong><mark style="background-color:rgba(0, 0, 0, 0)" class="has-inline-color has-vivid-red-color">CHEMICAL ELEMENTS AND COMPOUNDS</mark></strong></p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p><strong><mark style="background-color:rgba(0, 0, 0, 0)" class="has-inline-color has-vivid-cyan-blue-color">Meaning of Element</mark></strong></p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>Elements are substances that cannot be broken down into simpler substances by any chemical means. An element is a pure substance consisting only of atoms that all have the same number of protons in their nuclei. Everything in the world is built up from these elements.</p> <!-- /wp:paragraph --> <!-- wp:paragraph --> <p>By November 2016, the International Union of Pure and Applied Chemistry had recognized a total of one hundred and eighteen (118) elements, and it is still the total number of elements as at 2023. The first 94 occur naturally on earth while the remaining 24 are synthetic elements produced in nuclear reactions. Four of these elements included in 2016 are Nihonium (113), Moskovi (115), Tennessine (117), and Oganesson (118).</p> <!-- /wp:paragraph --> <figure class="wp-block-image size-full"><img src="https://www.primacyebooks.com/wp-content/uploads/2024/01/Elements.jpg" alt="Elements: Names, symbols and atomic numbers" class="wp-image-20484"/><figcaption class="wp-element-caption">Names of elements</figcaption></figure> <div class="sign-up-notice-after-excerpt-two" style="background-color:powderblue;"> You are viewing an excerpt of this lesson. Subscribing to the subject will give you access to the following: <ul> <li>The complete lesson note and evaluation questions for this topic</li> <li>The complete lessons for the subject and class (First Term, Second Term & Third Term)</li> <li>Media-rich, interactive and gamified content</li> <li>End-of-lesson objective questions with detailed explanations to force mastery of content</li> <li>Simulated termly preparatory exams</li> <li>Discussion boards on all lessons and subjects</li> <li>Guaranteed learning</li> <li>Win great prizes for topping the <a href="https://www.primacyebooks.com">Primacy Ebooks</a></li> </ul> </div> <div class="sensei-message info"></div>