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