Imagine burnt toast. The black particles you can scrape off the bread are actually clumps of carbon atoms.
6:27 · Physical Science
All carbon atoms are alike; they have the same number of protons. In the same way, all oxygen atoms are alike, all iron atoms are alike, and so on. Each kind of atom is an element. Carbon, oxygen, and iron are three of over one hundred elements. The atoms of different elements differ in the number of protons and electrons they have. Atoms with more electrons, such as uranium, which has 92 electrons, tend to be larger than atoms with fewer electrons, such as hydrogen, which has one electron.