HistoryTrends Metals, nonmetals, metalloids Groups Periods Other

Question The modern periodic table lists elements in order of increasing atomic________.

Answer 1 – 10 Number

Question Describe Mendeleev’s periodic table.

Answer 1 – 20 He arranged elements in order of increasing atomic mass.

Question Why is Mendeleev the “Father of the Modern Periodic Table” and not Meyer or both?

Answer 1 – 30 Mendeleev correctly predicted physical properties of three unknown elements.

Question How did Moseley update the Periodic Table?

Answer 1 – 40 After calculating the atomic number of elements, he rearranged the PT by increasing atomic number.

Question Assess the contributions of Mendeleev and Moseley to our modern understanding of the relationship between atomic structure and atomic behavior.

Answer 1 – 50 Mendeleev’s PT was able to show that groups/families of elements have similar properties depending on the size of the nucleus. (able to predict properties of atomic behavior based on guessed atomic mass) Moseley expanded upon Mendeleev’s ideas with atomic number (number of protons) defining an atom and its properties.

Question What is the trend for metallic reactivity across a period? (for example from sodium, to magnesium, then aluminum?)

Answer 2 – 10 Chemical reactivity of metals generally decreases across a period.

Question What is ionization energy?

Answer 2 – 20 Amount of energy needed to remove an electron to form a cation.

Question Describe the trend across a period and down a group for electronegativity.

Answer 2 – 30 The trend across a period for electronegativity increases. It decreases as it goes down a group.

Question What is the trend for atomic radius on the periodic table?

Answer 2 – 40 It decreases across a period and increases down a group.

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Question Where are the metals located on the periodic table?

Answer 3 – 10 To the left and cover most of the periodic table.

Question What type of element is Tungsten?

Answer 3 – 20 Transition metal

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