The periodic table

Describe how Dmitri Mendeleev initially arranged known elements in a periodic table based on the properties of the elements and their compounds.

Describe how Mendeleev utilized his periodic table to predict the existence and properties of undiscovered elements.

Explain that Mendeleev arranged elements by increasing relative atomic mass, but this was occasionally inaccurate due to the relative abundance of isotopes.

Explain the meaning of the atomic number of an element concerning its position in the periodic table and the number of protons in its nucleus.

Describe the modern periodic table layout, where elements are arranged in order of increasing atomic number into rows called periods and vertical columns called groups for elements with similar properties.

Identify elements as metals or non-metals based on their position in the periodic table, and explain this classification using their atomic structures.

Predict and represent the electronic configurations of the first 20 elements in the periodic table using diagrams and numerical formats (e.g., 2.8.1).

Explain the relationship between an element's electronic configuration and its specific position in the periodic table.