Homework Answers
first find the neutrons from the mass and atomic number
as shown below
mass number = atomic number + neutrons
1) mass = 15 , atomic number = 7 , then neutrons = 8
2) mass = 39 , atomic number = 19 , then neutrons = 20
3) mass = 24 , atomic number = 13 , then neutrons = 11
4) mass = 15 , atomic number = 8 , then neutrons = 7
5) mass = 35 , atomic number = 17 , then neutrons = 18
Element protons mass electrons neutrons
Ca 20 42 20 22
Ge 32 70 32 38
Br 35 79 35 44
no of protons are equal to no of electrons in neutral species having charge
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