Elements and Symbols יסודות וסמלים מהם יסודות? gold carbon aluminum Elements are pure substances from which all other things are built. gold carbon aluminum
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.
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
סמלים של יסודות שכיחים Symbols of some common elements: S, sulfur Au, gold Al, aluminum Ag, silver
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.
לדוגמא: תכונות פיסיקליות של נחושת ברק
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.
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
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
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
Solution פתרון תרגיל 2 Select the correct name for each symbol. 1. S B. sulfur 2. P C. phosphorus 3. Ag A. silver