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true or false
elements on the far right of the periodic table are classified as non metals |
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true or false
every atom of the same element has the same atomic number |
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true or false
for and atom to be neutral, the number of protons must = the number of neutrons |
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true or false
matter always has mass |
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| All __ except mercury are solids at room temperature |
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| how many atoms of calcium phosphate whose formula is Ca3(PO4)2 |
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| in general nonmetals are __ |
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| millions of compounds that exsist are made from approximatly ___ elements |
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| most of the mass of an atom is found in its ___ |
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| a certain atom has 26 protons, 26 electrons and 30 neutrons. its mass number is ____ |
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| ____ has mass and takes up space |
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| All matter is made up of particles called |
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| elements on the left side of the periodic table are classified as _______ |
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| elements that have propoerties halfway between those of metals and nonmetals are classified as ________ |
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| Rutherford's contribution to atomic models was the discovery of the _____ |
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| chloring-35 and clorine-37 are examples of __ |
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Definition
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| chlorine35 and chlorine-37 have diffrent number of _____ |
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| the lowest energy level of an atom is filled. its second level contains three additional electrons. What type of atom is it? xplain ur answer. |
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Definition
| it is an atom w/ 5 electrons. it is called boron |
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Term
| use the xample of inflating a flat tire after a repair. xplain why air is matter |
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Definition
| tire xpands b/c the air takes up space and thats a property of matter |
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give 4 examples of properties of nonmaetals that are exactly the oppisite of properties of metals. |
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Definition
- poor conducts of heat
- brittle
- dull
- poor conducts of electricity
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| suppose u found a sample of an element with the following properties: it is a dim yello solid at room temp, which shatters when hit with a hammer. how would you classify the element, and where would u expect to find id on the periodic table? explain |
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Definition
| it is a nonmetal located on the far right side of the table. |
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