Name _________________________________________ Period __________ Date _______________
KAP/GT
Atomic Math & Bohr Model HW
1. Which part of the atom determines the IDENTITY of the element? (circle below)
PROTON
NEUTRON
ELECTRON
2. Which parts of the atom determine the mass of an atom of an element? (circle below)
PROTON
NEUTRON
ELECTRON
3. What does the word NEUTRAL mean? ___________________________________________________
4. What number is best to give something that is considered “neutral”? ____________________________
5. If an atom is neutral, which parts of the atom must ALWAYS be equal?
__________________________
6. How can an atom become POSITIVELY charged? __________________________________________
7. How can an atom become NEGATIVELY charged? _________________________________________
8. Atomic Number = _________________ = _______________________
Mass Number - Atomic Number = _____________________________
9. Fill in the blanks: (REMEMBER to round the atomic mass to get the MASS NUMBER)
10.
Boron
Atomic Number
Mass Number
p=
Number of Protons
n=
Number of Electrons
5
B
Number of Neutrons
Boron
10.812
Number of Valence Electrons
11.
Sodium
Atomic Number
Mass Number
Number of Protons
Number of Electrons
p
=
n
=
Number of Neutrons
11
Na
Sodium
22.990
Number of Valence Electrons
12. These Bohr models show ONLY the valence electrons. What are the names of these elements?
______________
______________
______________
13. This is a model of oxygen. Draw a model of an atom that would REACT WITH oxygen.
This NEUTRAL atom has a mass of 16 AMU.
14. How many Protons does it have? ___________________ How can you tell?
______________________________________________________________________
15. If the atom changes, and now has a charge of +1, how would the model change?
______________________________________________________________________
16. What would happen if the model somehow lost a proton? _____________________