June 2019 Chemistry Regents #1-5

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1. Which particles are found in the nucleus of an argon atom?

(1) protons and electrons

(2) protons and neutrons

(3) protons and neutrons

(4) positrons and electrons

 

3  Protons and Neutrons in the nucleus

electrons outside

3  Undeflected means no charge

 

neutrons=no charge

 

3.  The mass of an electron is

(1) equal to the mass of a proton

(2) equal to the mass of a neutron

(3)  greater than the mass of a proton

(4)  less than the mass of a neutron

 4  protons =neutrons

electrons much smaller mass

 

4 Compared the energy of an electron in the second shell of an atom of sulfur, the energy of an electron in the

(1)  first shell is lower

(2)  first shell is the same

(3)  third shell is lower

(4)  third shell is the same

 		1  higher energy level surprising has more energy than lower energy level electrons
5 In the ground state, an atom of which element has seven valence electrons?

(1)  sodium

(2)  phosphorous

(3)  nitrogen

(4)  fluorine

 4  use the periodic table

last number

2-7  fluorine

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Questions 51 Questions 52-54 Questions 55-57 Questions 58-61 Questions 62-65 Questions 66-69 Questions 70-73 Questions 74-77 Questions 78-80 Questions 81-85  

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