June 2016 Chemistry Regents #1-5
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Questions | Answer | Links | Explanations |
1 Which statement describes the charge of an electron and the charge of a proton? (1) An electron and a proton both have a charge of +1. (2) An electron and a proton both have a charge of —1. (3) An electron has a charge of +1, and a proton has a charge of -1. (4) An electron has a charge of —I, and a proton has a charge of +1. | 4 | electrons are -1 protons are +1 | |
| 2 Which subatomic particles are found in the nucleus of an atom of beryllium? (1) electrons and protons (2) electrons and positrons (3) neutrons and protons (4) neutrons and electrons | 3 | nucleus contains protons and neutrons only | |
3 The elements in Period 4 on the Periodic Table are arranged in order of increasing (1) atomic radius (2) atomic number (3) number of valence electrons (4)number of occupied shells of electrons | 2 | period 4 (left to right) is in order of atomic number | |
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4 Which phrase describes two forms of solid carbon, diamond and graphite, at STP? (1) the same crystal structure and the same properties (2) the same crystal structure and different properties (3) different crystal structures and the same properties (4) different crystal structures and different properties | 4 | diamond and graphite had different properties because they have different structures | |
5 Which element has six valence electrons in each of its atoms in the ground state? (1) Se (3) Kr (2) As (4) Ga | 2 | last number in the electron configuration group 16 all have 6 valence electrons | |
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