January 2010 Chemistry Regents #64-65

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

Questions 51-52 Questions 53-55 Questions 56-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-75 Questions 76-78 Questions 79-81  Questions 82-84

 

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Questions

Base your answers to questions 64 through 65 on the information below.

The nucleus of one boron atom has five protons and four neutrons.

64 Determine the total number of electrons in the boron atom. [1]

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ANSWER==> 5

Borons config.  2-3 (from P.T.)

also, protons equal electrons in atoms

65 Determine the total charge of the boron nucleus. [1]

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+5

the nuclear charge is only the charge of the protons (no electrons in the nucleus and neutrons are neutral)

On to Questions 66-68

 

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

Questions 51-52 Questions 53-55 Questions 56-57 Questions 58-60 Questions 61-63 Questions 64-65 Questions 66-68 Questions 69-71 Questions 72-75 Questions 76-78 Questions 79-81  Questions 82-84

 
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