Xinyi is arranging a set of unknown elements in a table. She notices their properties change gradually. To correctly arrange them like in the Periodic Table, how should she order them?
John compares sodium (Na) and potassium (K) in class. He notices they both form ions with a +1 charge. What explains this similarity?
During a practical, Xinyi tests four elements for conductivity and lustre. Only one is shiny and conducts electricity well. Which is it?
John wants to explain why neon (Ne) is unreactive in chemical reactions. What is the most accurate reason?
At the scrapyard, Xinyi points at a rusted chain and says, 'That’s oxidation for you!' Which of the following is essential for the rusting of iron to occur?
Trying to impress Xinyi, John suggests wrapping the bike frame with aluminium foil to prevent rust. Which method of rust prevention does this represent?
Which element below would likely form a coloured ion with a +3 oxidation state?
Johb asks Xinyi: "Which property best explains why argon is used in light bulbs?"
A newly discovered element by John has properties similar to sodium. It reacts violently with water, forms a basic oxide, and has one valence electron. Which statement is most likely true about its location on the Periodic Table with respect to Sodium?