An element Y Y\,Y is dull, brittle, and does not conduct electricity. State whether element Y Y\,Y is a metal or a non-metal.
Explain the differences in physical properties between metals (found on the left of the periodic table) and non-metals (found on the right of the periodic table), focusing on electrical conductivity, malleability, and melting/boiling points.
Sodium (Na\text{Na}Na, atomic number 11) is in Group 1 of the Periodic Table, and Neon (Ne\text{Ne}Ne, atomic number 10) is in Group 0. Explain why Group 1 elements like sodium are highly reactive, whereas Group 0 elements like neon are unreactive. Refer to their electronic configurations in your answer.