click below
click below
Normal Size Small Size show me how
science exam review
section 3: atoms and periodic table.
| Question | Answer |
|---|---|
| An element that is malleable, ductile, has luster, and is a good conductor of heat and electricity is called what? | metal |
| A row of elements whose properties change gradually and predictably is also known as what? | period |
| A column of elements that have similar physical or chemical properties is also known as what? | group |
| The most chemically inactive group of elements (very stable) are called_______ | nobel gases |
| Elements that are gases or brittle solids and poor conductors of heat and electricity are called what? | non metals |
| Which element has the fewest number of protons? | helium |
| Which element has an average atomic mass of 12? | carbon |
| Which element's nucleus contains 11 protons? | sodium |
| list and describe the 3 parts of an atom | Proton- found in nucleus, positive charge. neutron-found in nucleus, neutral charge. electron-found in electron cloud, negative charge. |
| what are some properties of a nonmetal? | brittle solids, gases, poor conductors of heat and electricity. |
| Which element has similar properties to boron? | aluminum |
| how are elements on the periodic table arranged? | in order by their atomic numbers. |
| based on partial periodic table above, what elements are metals (remember what side metals are on)? | lithium, berylium, aluminum, sodium, magnesium, potassium, calcium. |
| what is the atomic mass of an element equal to? | the number of protons and neutrons. |
| number 47 can not be typed here. | number 47 cannot be typed here. |
| an atom of nickel has an atomic # of 28. it has an atomic mass of 59. tell how many protons, neutrons, and electrons. | 28 protons, 28 neutrons, 31 electrons. |