הורד מצגת
המצגת נטענת. אנא המתן
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Elements and Symbols יסודות וסמלים מהם יסודות? gold carbon aluminum
Elements are pure substances from which all other things are built. gold carbon aluminum
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Sources of Some Element Names
מקור השם של היסודות Sources of Some Element Names Some elements are named for planets, mythological figures, minerals, colors, scientists, and places.
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Symbols of Elements הסמלים של היסודות A symbol
represents the name of an element. consists of 1 or 2 letters. starts with a capital letter. Examples: 1-Letter Symbols 2-Letter Symbols C carbon Co cobalt N nitrogen Ca calcium F fluorine Al aluminum O oxygen Mg magnesium
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סמלים של יסודות שכיחים Symbols of some common elements:
S, sulfur Au, gold Al, aluminum Ag, silver
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תכונות פיסיקליות של יסודות
Physical properties are observed or measured without affecting the identity of a substance. include shape, physical state, boiling and freezing points, density, and color of that substance.
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לדוגמא: תכונות פיסיקליות של נחושת
ברק
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שינוי פיסיקלי A physical change occurs in a substance if there is
a change in the state. a change in the physical shape. no change in the identity and composition of the substance.
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תרגיל 1 Learning Check Select the correct symbol for each of the following: 1. Calcium A. C B. Ca C. CA 2. Nitrogen A. N B. Ne C. Na 3. Iron A. Ir B. FE C. Fe
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Solution פתרון תרגיל 1 Select the correct symbol for each of the following: 1. Calcium B. Ca 2. Nitrogen A. N 3. Iron C. Fe
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Learning Check תרגיל 2 Select the correct name for each symbol. 1. S
A. sodium B. sulfur C. selenium 2. P A. potassium B. phlogiston C. phosphorus 3. Ag A. silver B. agean C. gold
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Solution פתרון תרגיל 2 Select the correct name for each symbol.
1. S B. sulfur 2. P C. phosphorus 3. Ag A. silver
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