January 2007 Chemistry Regents #1-10

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Other Regents Exams

Questions	Answer	Explanations
1 Which subatomic particles are located in the nucleus of a neon atom? (1) electrons and positrons (2) electrons and neutrons (3) protons and neutrons (4) protons and electrons	3
2 The total mass of the protons in an atom of gold-198 is approximately (1) 79 atomic mass units (2) 119 atomic mass units (3) 198 atomic mass units (4) 277 atomic mass units	1
3 In a calcium atom in the ground state, the electrons that possess the least amount of energy are located in the (1) first electron shell (2) second electron shell (3) third electron shell (4) fourth electron shell	1
4 Which group of atomic models is listed in historical order from the earliest to the most recent? (1) hard-sphere model, wave-mechanical model, electron-shell model (2) hard-sphere model, electron-shell model, wave-mechanical model (3) electron-shell model, wave-mechanical model, hard-sphere model (4) electron-shell model, hard-sphere model, wave-mechanical model	2
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6 An atom of argon rarely bonds to an atom of another element because an argon atom has (1) 8 valence electrons (2) 2 electrons in the first shell (3) 3 electron shells (4) 22 neutrons	1
7 The elements on the Periodic Table are arranged in order of increasing (1) boiling point (3) atomic number (2) electronegativity (4) atomic mass	3
8 Which element is classified as a nonmetal? (1) Be (3) Si (2) Al (4) Cl	4
9 Solid samples of the element phosphorus can be white, black, or red in color. The variations in color are due to different (1) atomic masses (2) molecular structures (3) ionization energies (4) nuclear charges	2
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