An Introduction to Honors Chemistry Exam Study Guide

An Introduction to Honors Chemistry Exam Study Guide Name two important Greek philosophers/scientists who contributed to the earliest ideas on atoms. - Answer️️ -Democritus and Aristotle The concept of atoms reached its earliest modern form in 1808 when who wrote the book A New System of Chemical Philosophy? - Answer️️ -John Dalton An element is a substance made up of a unique type of what? - Answer️️ -Atom Atoms of elements combine to form what? - Answer️️ -Chemical Compounds Protons, neutrons, and electrons are subatomic particles. Name the charge and location of each. - Answer️️ -Proton- + charge, nucleus Electron- - charge, energy shells Neutron- No charge (neutral), nucleus Write the weight, in atomic mass units, of a proton in scientific notation. - Answer️️ - (1.67 * 10^-24) grams (1 atomic mass unit) Write the weight, in atomic mass units, of a neutron in scientific notation. - Answer️️ - (1.67 * 10^-24) grams (1 atomic mass unit) Write the weight, in atomic mass units, of an electron in scientific notation. - Answer️️ - (9.11 * 10^-28) grams (0 atomic mass units) ©SOPHIABENNETT 2024/2025 9:45 AM Page | 2 How many electrons would it take to equal the mass of one proton? - Answer️️ -1,830 electrons Due to an electron's mass in comparison to protons and neutrons, we do not count the mass of the electrons in calculating what? - Answer️️ -Atomic Mass What makes the atom of a single element unique? - Answer️️ -Periodicity