Elements are made up of only one type of atom from "summary" of Chemistry Simplified NCERT Class 11 by Sanjay Sharma
When we talk about elements, we are referring to the fundamental building blocks of matter. Each element is composed of just one type of atom. This means that all the atoms within a particular element have the same number of protons in their nucleus. For example, all atoms of hydrogen have one proton, while all atoms of oxygen have eight protons. The concept of elements being made up of only one type of atom is crucial in understanding the periodic table of elements. The periodic table lists all the known elements in the universe and organizes them based on their atomic number, which is the number of protons in the nucleus of each atom. This organization allows us to see patterns and trends among the elements, which helps us predict their properties and behaviors. For instance, elements in the same column of the periodic table, known as a group, tend to have similar chemical properties because they have the same number of valence...
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