STUDY GUIDE

Master atomic structure with this comprehensive worksheet! Perfect for reviewing atoms, physical & chemical changes.

NUCLEUS NEUTRON PROTON ELECTRON Which scientist is best known for research that led to the modern understanding of the atom? Describe Thomson's contribution to the atomic theory Which of the following best describes the discovery of the atom? its existence was proven with understanding of quantum mechanics its existence was determined by an English scientist studying nature its existence was hypothesized based on observations of larger samples of matter its existence was established after the invention of microscope and telescope The results of the next experiment (Ernest Rutherford) were included in kinetic molecular theory plate tectonic theory natural selection atomic theory What do the circles around the nucleus represent? the exact path of an electron orbit the number of locations of electrons in the atom the allowed energy levels of the electron of the atom the location of the electrons Draw an atom with the next parts:1- nucleus2- 2 energy levels3- 3 protons4- 4 neutrons5- 3 electrons (2 electrons in the first ring - 1 electron in the second ring) Atomic mass is defined as the number of protons and neutrons in an atom Oxygen reacts with iron to produce rust and with hydrogen to produce water. Which statement describes both reactions? new molecules are formed but the same element exist a different mixture is formed in each case both a change of state and of elements is involved a different solution is formed in each case Classify the next as physical or chemical changes PHYSICAL GRIND EVAPORATION DISSOLVE IN WATER CUT MELTING CHEMICAL FORMATION OF A SOLID CHANGE IN COLOR GAS PRODUCTION CHANGE IN ODOR CHANGE IN TEMPERATURE Match the next pictures with the correct chemical change RUSTING BAKING FOOD SPOILING BURNING Physical changes are reversible and do not produce a new substance. Chemical changes result in the production of a new substance and cannot be reversed. An atom includes 4 protons, 4 electrons and 5 neutrons. What is the mass of the atom 4 8 9 3 symbol atomic mass name atomic number HOW MANY PROTONS DOES ALUMINIUM HAVE? 26.98 26 13 39.98 What gives an atom mass? protons neutrons in the nucleus Protons electrons in the nucleus electrons in the cloud Protons electrons in the cloud The number of protons is equal to the number of neutrons the energy levels the atomic number What is the atomic mass of an element with 40 protons, 40 electrons, and 46 neutrons? 80 126 86 40 The elements in the modern periodic table are arranged in order of their atomic numbers, which is the number of protons in the nucleus.