NAME___________________________________________PER _____ ATOMIC STRUCTURE WORKSHEET
Fill in the blanks for the elements in this chart. For the purposes of this chart, round all atomic
masses to the nearest whole number.
Element
Element
# of
# of
# of
Atomic
Atomic
Symbol
protons
neutrons
electrons
Mass
number
Lithium
Carbon
Chlorine
Silver
Lead
Calcium
Tantalum
Radium
Samarium
Uranium
Americium
Hydrogen
An isotope of carbon contains 6 protons and 8 neutrons.
1. What is its atomic number?
2. What is the mass number?
3. Write the nuclear symbol for this isotope
4. How many electrons would a neutral atom have?
5. Complete the table
Nuclear
Symbol
# Of Protons
4
2𝐻𝑒
# Of
Neutrons
2
2
6
8
# Of
Electrons
Atomic
Number
Mass
Number
12
6𝐶
16
8𝑂
8
17
54
26𝐹𝑒
30
26
6. Which of the pairs of atoms in the table above are isotopes of the same element? (Write
them using the nuclear symbol)
7. ___________________ Model of the Atom describes the atom as a positive ball with
spots of negative embedded inside.
8. Describe the atom from John Dalton’s point of view.
9. Is O3 an element or a compound? __________________
10. What is one evidence of the Big Bang Theory?_____________________________
____________________________________________________________
11. Write in scientific notation 60,557,000 ____________________
12. Is a cup of Kool-Aid a homogeneous mixture or heterogeneous mixture?