Atomic Structure Lab




Atomic Structure

1.The 3 particles of the atom are:




Their respective charges are:




2.The number of protons in one atom of an element determines the atom’s

______________________,and the number of electrons determines

______________________of and element.

3.The atomic number tells you the number of ______________________in one atom of an element. It also tells you the number of _____________________in a neutral atom of that  element. The atomic number gives the “identity “ of an element as well as its location on the

Periodic Table. No two different elements will have the                                                          _____________ atomic number. 

4.The ______________________of an element is the average mass of an element ’s naturally occurring atom, or isotopes, taking into account the ______________________of each isotope.

5.The ______________________of an element is the total number of protons and neutrons in  the______________________ of the atom.

6.The mass number is used to calculate the number of ______________________in one atom of an element. In order to calculate the number of neutrons you must subtract the ___________________from the ______________________.

7.Give the symbol and number of protons in one atom of:

Lithium __________________    Bromine __________________

Iron __________________         Copper __________________

Oxygen __________________   Mercury __________________

Krypton __________________Helium _____________________

8.Give the symbol and number of electrons in a neutral atom of:

Uranium __________________ Chlorine __________________

Boron __________________     Iodine __________________

Antimony __________________Xenon __________________

9.Give the symbol and number of neutrons in one atom of:

(To get “mass number ”,you must round the “atomic mass ” to the nearest whole number)) Show your calculations.

Barium __________________Bismuth __________________

Carbon __________________Hydrogen __________________

Fluorine __________________Magnesium __________________

Europium __________________Mercury __________________

10.Name the element which has the following numbers of particles:

a.26 electrons,29 neutrons,26 protons _____________________

b.53 protons,74 neutrons _____________________

c.2 electrons (neutral atoms)_____________________

d.20 protons _____________________

e.86 electrons,125 neutrons,82 protons (charged atom                  


f.0 neutrons _____________________

11 .If you know only the following information can you always determine what the element is?   (Yes/No).

a. number of protons ___________

b.number of neutrons___________

c.number of electrons in a neutral atom___________

d.number of electrons___________

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