August 2015 Chemistry Regents #31-35
Highlight to reveal answers and explanations
| |||
Questions | Answer | Links | Explanations |
| 31 Which conclusion was drawn from the results of the gold foil experiment? (1) An atom is electrically neutral. (2) An atom is mostly empty space. (3) The nucleus of an atom is negatively charged. (4) The electrons in an atom are located in specific shells. | 2 | link | empty space, positive nucleus |
| 32 Which electron configuration represents an atom of magnesium in an excited state? (1) 2𤪙 (3) 2𤾄 (2) 2𤪜 (4) 2𤾇 | 1 | link | need 12 electrons and one is in a higher energy level than the configuration on the PT |
| 33 Which group on the Periodic Table has elements with atoms that tend not to bond with atoms of other elements? (1) Group 1 (3) Group 17 (2) Group 2 (4) Group 18 | 4 | link | Noble Gases |
| |||
| 34 Which group on the Periodic Table has at least one element in each of the three phases of matter at STP? (1) 1 (3) 17 (2) 2 (4) 18 | 3 | link | group 17 Gases F2 and Cl2 Liquid Br2 Solid I2 |
| 35 Rubidium and cesium have similar chemical properties because, in the ground state, the atoms of both elements each have (1) one electron in the outermost shell (2) two electrons in the outermost shell (3) one neutron in the nucleus (4) two neutrons in the nucleus | 1 | link | reactivity is based on valence electrons |
| |||