Name: _____________________________________________________ Date: ________________
Atomic Notation Worksheet
Fill in the blank cells on the following table. You may need to determine the name of the element, the
symbol, atomic number, mass number, or the number of SAPs. Remember the following:
1. Atomic number = # of p+ = # of e- (in a neutral atom)
2. Mass number = p+ + n
3. Neutrons = mass number – p+
4. Protons = mass number – n
Element
hydrogen
Symbol
Atomic
#
Mass #
9
19
# of p+
# of n
16
17
# of e-
H
fluorine
sulfur
16
34
36
29
O
29
6
14
14
15
Uranium
34
7
7
238
234
92
2
2
1
2
1. Give the symbol and number of protons in one atom of:
Lithium __________________
Bromine __________________
Iron __________________
Copper __________________
Oxygen __________________
Mercury ________________
Krypton __________________
Helium __________________
Tin ____________________
2. Give the symbol and number of electrons in a neutral atom of:
Uranium __________________
Chlorine __________________
Boron __________________
Iodine __________________
Antimony ________________
Xenon _________________
3. Give the symbol and number of neutrons in one atom of the element below. 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 __________________
Radium ________________
4. 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 _____________________
5. If you know only the following information can you always determine what the element is? Yes or No.
a. number of protons ___________
b. number of neutrons___________
c. number of electrons in a neutral atom___________
d. number of electrons___________