| LI 4: We are learning to describe Atoms
Read this website and answer the following questions about atoms: What is an atom? a-atom-is-a-particle-that-makes-up-everything What is a proton? a-charged-particle-in-a-atom What is a neutron? an-uncharged-particle-in-a-atom. What is an electron? a-negatively-charged-particle-in-a-atom Each element has a different number of protons. This is how we tell them apart. They also have different number of neutrons and electrons, but these can change. Helium has 2 protons so its atomic number is 2, it also has 1 or 2 neutrons and 2 electrons. This is different to Lithium which has 3 protons and an atomic number of 3. It also has 3 electrons and 3 or 4 neutrons. Each element has its own symbol.
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