🧪 Chemistry Trivia Quiz
From the periodic table to chemical bonds, acids to radioactivity — chemistry explains the very building blocks of everything around us. This quiz covers fundamental concepts, famous elements, key scientists, and real-world chemical principles. Think you have what it takes to score a perfect 12?
Answers Explained
Q: Why does gold have the symbol Au and not Go?
A: Many element symbols come from their Latin or Greek names, not their English ones.
Gold's symbol Au comes from the Latin 'aurum'. Similarly, silver is Ag (argentum), iron is Fe (ferrum), copper is Cu (cuprum), and lead is Pb (plumbum). These symbols were standardized when Latin was the international language of science in the 18th and 19th centuries.
Q: How did Mendeleev know to leave gaps in his periodic table?
A: He noticed patterns in element properties and predicted elements that hadn't been discovered yet.
When Mendeleev arranged elements by atomic weight in 1869, he left gaps where the pattern suggested undiscovered elements should exist. He predicted the properties of gallium, germanium, and scandium with remarkable accuracy. Their later discovery validated the periodic law and cemented his table as one of science's greatest achievements.
Q: Why is mercury the only liquid metal at room temperature?
A: Its unique electron configuration weakens the metallic bonds, lowering its melting point dramatically.
Mercury's relativistic effects on its outermost electrons reduce its tendency to form strong metallic bonds compared to other metals. This gives it an unusually low melting point of -38.83°C. Mercury was historically used in thermometers and barometers, though its toxicity has led to widespread replacement with safer alternatives.
Frequently Asked Questions
What element has the symbol Au?
Au is the chemical symbol for gold, derived from the Latin word 'aurum'. Gold has atomic number 79 and has been prized by civilizations for thousands of years for its beauty, rarity, and resistance to corrosion.
How many elements are in the periodic table?
As of 2024, the periodic table contains 118 confirmed elements, ranging from hydrogen (atomic number 1) to oganesson (118). The four newest elements — nihonium (113), moscovium (115), tennessine (117), and oganesson (118) — were officially named in 2016.
What is the difference between an atom and a molecule?
An atom is the smallest unit of a chemical element that retains its properties. A molecule forms when two or more atoms are chemically bonded together — for example, two hydrogen atoms bond with one oxygen atom to form a water molecule (H2O).
What makes something acidic or basic?
Acids release hydrogen ions (H+) when dissolved in water, giving them a pH below 7. Bases release hydroxide ions (OH-) and have a pH above 7. The pH scale runs from 0 to 14, with 7 being neutral — as in pure water at 25°C.
Who is the father of modern chemistry?
Antoine-Laurent Lavoisier (1743–1794) is considered the father of modern chemistry. He identified oxygen's role in combustion, named hydrogen, helped create the metric system, and wrote the first modern chemistry textbook. He was guillotined during the French Revolution.
