Chemistry
Atomic Structure

1.The 3 particles of the atom are:
a.______________________
b.______________________
c.______________________
Their respective charges are:
a.______________________
b.______________________
c.______________________

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

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 total number of protons and neutrons in the______________________ of the atom.

5. An atom with the same atomic number but different numbers of neutrons is an __________________. It is still the ____________(same or different) element as long as the atomic number is the same.

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

Lithium __________________ Bromine __________________
Iron __________________ Copper __________________
Oxygen __________________ Mercury __________________
Krypton __________________ Helium _____________________

7. Give the symbol and number of electrons in a neutral atom of:
Uranium __________________ Chlorine __________________
Boron __________________ Iodine __________________
Antimony __________________Xenon __________________





8. Name the element that 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 _____________________

9. 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___________