13545210
Descrição
FlashCards por Sara. H S., atualizado more than 1 year ago
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Criado por Sara. H S.
mais de 6 anos atrás
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| Questão | Responda |
| What is all matter made out of? | Atoms |
| How many types of atoms are there? | ≈100 |
| What do scientists use to see atoms? | a scanning tunnelling microscope (STM) |
| What is element? | substances that are made out of one type of atom |
| What is an example of an element? | Any elements such as copper, oxygen, iron, hydrogen, gold, etc... |
| What are elements classified as? | Elements are classified as either non-metallic or metallic |
| What are the properties of metals? | 1. they are lustrous 2. they are solid at room temperature 3. they are good conductors of heat and electricity 4. they are malleable 5. they are ductile |
| What is special about mercury? | Mercury is the only metal that is liquid at room temperature |
| What is special about non-metals? | They have low melting and boiling points |
| What are the properties of non-metals? | 1. they are dull 2. they insulate electricity and heat 3. they are brittle |
| What is special about bromine? | it is the only non-metal that is liquid at room temperature |
| What are some examples of non-metals? | Non-metals such as charcoal, iodine, chlorine, sulfur, etc... |
| How many of the 118 elements on the periodic table occur in nature? | 98 |
| How does the periodic table list the elements? | from lightest to heaviest |
| What is the symbol for Calcium? | Ca |
| What is atomic number of potassium (K)? | 19 |
| What is the symbol for gold? | Au |
| What are monatomic elements? | rare elements that are made up of individual atoms (e.g. neon, argon, krypton, etc...). Only six are naturally occurring. |
| What are molecules? | clusters of two or more atoms that are put together |
| What are crystal lattices? | large grid-like structures that repeat in a series of atoms. All metals have them. |
| What is an example of the few non-metals that have lattices? | graphite |
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