Subject: Chemistry
Book: General Chemistry
The periodic table evolved from attempts to classify elements based on their atomic masses and properties. Dmitri Mendeleev’s 1869 arrangement left gaps for undiscovered elements, predicting their properties with remarkable accuracy. Later, Henry Moseley’s work on atomic numbers refined the table’s order. The periodic table remains central to chemistry, guiding research in discovering new elements and understanding chemical trends.
What is the chemical formula for potassium nitrate?
View QuestionWhat is the chemical formula for silicon dioxide?
View QuestionWhich element is essential for the formation of hemoglobin?
View QuestionWhich gas is used in neon signs?
View QuestionWhich element is represented by the symbol 'Pb'?
View QuestionWhat is the chemical formula for sodium carbonate?
View QuestionWhich element is represented by the symbol 'Ag'?
View QuestionWhich element has the atomic number 26?
View QuestionWhich non-metal element is liquid at room temperature?
View QuestionWhich gas is most abundant in Earth's atmosphere?
View Question