What pattern do you see?Īs the periodic number increases, the number of electrons increased Observe the radii of the elements in group 2. Observe : What happens to the radius as you move down group 1?.Record in the table.Ītomic radius (pm) 53pm 167pm 190pm 243pm 265pm 298pm As you do so, count theĮnergy levels (shown as rings of electrons) in each atom. Collect data : Use the ruler to measure the atomic radii of the gr oup 1 elements.Predict : How do you think the radius of an atom will change as you move down a group (vertical column)Īs you move down a group, the atomic radius gets larger, so atoms have a weaker hold on their electrons and are less reactive.Question: What factors affect the radius of an atom? Check that Atomic radius is selected from the.The outermost electron, or valence electron. On the right side of the Gizmo, select Li.Notice that the radius is measured in picometers (pm). What is the radius of hydrogen? 53 picometers.To measure the radius, drag one end of the ruler to the proton in the nucleus and the To begin, check that H (hydrogen) is selected in Group 1 on the The atomic radius is a measure of the size of the electron cloud, or the region whereĮlectrons can be found. Trends Gizmo, you will explore this relationship and how it affects the properties of
Size of an atom determines how strongly the nucleus attracts electrons. Just as the thickness of a book changes how strongly a magnet attracts a paper clip, the What is the relationship between the thickness of the book and the ability of the magnet to hold on to and.Which magnet would be most likely to attract additional paper clips?.On the image at right, the two magnets are the same.Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Nonmetal, nucleus, period, periodic trends, picometer, valence electron Vocabulary: atomic radius, electron affinity, electron cloud, energy level, group, ion, ionization energy, metal, Name: Date: Student Exploration: Periodic Trendsĭirections: Follow the instructions to go through the simulation.
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