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Early chemists used the properties of elements to sort them into groups, or triads. 1700: 13 elements.

Published byMyles Kenneth Carson Modified over 8 years ago

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Presentation on theme: "Early chemists used the properties of elements to sort them into groups, or triads. 1700: 13 elements."— Presentation transcript:

1 Early chemists used the properties of elements to sort them into groups, or triads. 1700: 13 elements

2 Newlands and Meyer arrange elements by atomic mass and notice similar properties. 1864: 56 elements 1869: 63 elements Dmitri Mendeleev got an idea from his favorite card game…

3 Newlands and Meyer arrange elements by atomic mass and notice similar properties. 1864: 56 elements 1869: 63 elements Dmitri Mendeleev got an idea from his favorite card game…

4 Newlands and Meyer arrange elements by atomic mass and notice similar properties. 1864: 56 elements 1869: 63 elements Dmitri Mendeleev got an idea from his favorite card game… Mendeleev arranged the elements by increasing atomic mass and by similar properties.

5 Mendeleev’s table predicted the properties of undiscovered elements.

6 Properties of Gallium Mendeleev’s predictions Actual Properties Atomic mass6869.7 Density6.0 g/cm 3 5.9 g/cm 3 Appearancesoft gray metal Melting pointLow melting point29.8°C Elements later discovered: Gallium, Germanium, and Scandium

7 Gallium Properties of Gallium Mendeleev’s predictions Actual Properties Atomic mass6869.7 Density6.0 g/cm 3 5.9 g/cm 3 Appearancesoft gray metal Melting pointLow melting point29.8°C Elements later discovered: Gallium, Germanium, and Scandium

8 Newlands and Meyer arrange elements by atomic mass and notice similar properties. 1864: 56 elements 1869: 63 elements Dmitri Mendeleev got an idea from his favorite card game… Mendeleev arranged the elements by increasing atomic mass and by similar properties. Moseley arranges elements by the newly discovered “atomic number.” 1913: atomic numbers

9 Period: a row across the table. each period is an energy level

10 Group : a column down the table. same group, similar prop’s

11 The modern periodic table arranges elements by increasing atomic number. Periodic Law: periodic repetition of properties properties change across a period. properties repeat from period to period.

12 Metallic less Metallic 3 classes of elements are: MetalsNonmetalsMetalloids (most elements)

13 MetalsNonmetalsMetalloids luster (shiny) malleable (sheets) ductile (wires) good conductors (heat/electricity) most gases brittle solids poor conductors dull/shiny brittle semi- conductors

14 1. Mendeleev arranged the elements in his periodic table in order of increasing _________ and by _________ properties. A.atomic number, similar B.number of protons, repeating C.number of electrons, similar D.atomic mass, repeating Quick Quiz!

15 2. The modern periodic table is arranged by increasing.. A.mass number. B.density. C.atomic number. D.intelligence. Quick Quiz.

16 3. Elements in the same group have… A.very little in common. B.the same atomic number. C.different chemical properties. D.similar chemical properties. Quick Quiz.

17 4. Which one of the following is NOT a general property of metals? A.ductility B.malleability C.high luster D.poor conductor of heat and electricity Quick Quiz.

18 5. Which list of elements contains only nonmetals? A. Sn, P, Cl B. S, Na, O C. Ge, Br, Ne D. O, I, H Quick Quiz.

19 6.Identify each as metal, nonmetal, or metalloid: A.Copper: B.Boron: C.Sulfur: D.Sodium: E.Tin: F.Hydrogen: Metal Quick Quiz. Metalloid Nonmetal Metal Nonmetal

20 7.Identify the following sample of an unknown substance as a metal, nonmetal, or metalloid: solid at room temp. Quick Quiz. will break rather than bend conducts electricity only at high temp’s Metalloid

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