OBJECTIVES: Assessing the routine table. Determining why facets integrate. VOCABULARY: element negative routine table positive MATERIALS:

Students check out why facets jointogether to form compounds.

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Hematite

BACKGROUND: The even more expocertain students have to the Periodic Table the even more acquainted they will certainly become via the elements. The Periodic Table is arranged so that nonsteels are on the best side of the chart and steels on the facility and to the left. The shade coding on the chart indicates this classification. Keep in mind the right-descfinishing "stairinstance line" separating nonsteel and also steels. The elements to the instant left of the "stairsituation line" are dubbed "semi-metals" or "metalloids" because they have the right to behave actually chemically as both steels or nonmetals. The metallic aspects are identified by a metallic luster and also high electric and thermal conductivity. The nonmetals might be gases, liquids or crystalline solids.

An aspect that has a charge is dubbed an "ion." Usually, the steels have actually a positive charge (a positive ion) and also the nonsteels a negative charge (an adverse ion). Tbelow are several exceptions to this ascendancy yet tbelow is no should allude this out to the students at this time. A chemical reactivity can take area once a positively charged element meets a negatively charged element.

Minerals are compounds made of facets that have actually both negative and also positive charges, which incorporate so that the in its entirety charge equates to zero, making the compound electrically neutral. For example table salt (the mineral halite) is created of sodium, which has actually a +1 charge, and also chlorine, which has a charge of -1. Due to the fact that there are equal numbers of sodium and chlorine atoms in halite, the all at once charge is zero. We will certainly not be came to with balancing charges in this activity, because the primary allude is to show that positive and also negative aspects come together.

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PROCEDURE: Pass out the Periodic Table placemats. Exsimple the metals vs. nonsteels plan of the facets on the table to the students. Point out the staircase line. On the ideal of the line are the nonmetals. These deserve to be liquids, gasses or crystalline elements. On the left of the line are the steels. The aspects appropriate next to the stairinstance line are "strange" aspects that are referred to as "metalloids" or "semi-metals". They can act as both steels and nonsteels. Tell the students that those aspects to the left of the staircase line are attracted to those facets on the ideal. The steels have a positive (+) charge and also the nonsteels have actually an unfavorable (-) charge. This causes them to desire to stick together so they deserve to end up being neutral. A positive plus an unfavorable produces a neutral compound. Tell the students that once facets join together they create a brand-new product called a compound. Compounds deserve to look and act very in different ways from the facets that made them. Write the adhering to on the board:
With the class recognize which is the positive and also negative component of the minerals (as in chart below). Use NaCl (halite) as your instance, by asking students to uncover Na and also Cl on the routine table. Have them determine whether the facet is positive or negative by looking at its location on the routine table.

POSITIVE

NEGATIVE MINERAL
Fe O hematite
Na Cl halite
Si O quartz
Fe S pyrite
Pb S galena
Ca F fluorite