Name ________________________________________
Atoms Study Guide
1. Most of the mass of an atom is found in the ____nucleus______.
2. The atomic number is equal to the number of ________protons________
3. The number of protons is equal to the number of ____electrons__________
4. The ____atomic mass____________ is equal to the number of protons plus the
number of neutrons.
4. The _______protons__________ and __________neutrons_________ are found
in the nucleus.
5. Write each part of the atom and the charge for each part.
Protons – positive charge
Neutrons – neutral or no charge
Electrons - negative charge
6. A pure substance made of only one kind of atom is called an __element_____
7. Can two different elements (gold and silver) have the same atom? YES
NO
8. What makes one element different from another?
The number of protons is different for each element
9. If an element’s atomic number is 9 and atomic mass is 19, how many protons does it
have? ___9____
10. Complete the chart:
Element
Element
Name
Symbol
Silver
Ag
Magnesium Mg
Sulfur
S
Mercury
Hg
Plutonium
Pu
Atomic
Number
47
12
16
80
94
Atomic
Mass
108
24
32
201
244
# of
protons
47
12
16
80
94
# of
neutrons
61
12
16
121
150
# of
electrons
47
12
16
80
94
(for the quiz, there will be different elements, but there will be a chart like this)
11. Identify this atom:
__magnesium______
12. Draw a model of a chlorine atom. Include the protons, neutrons, and electrons
17 electrons
17 protons
18 neutrons
13. Why are there an equal number of protons and electrons in an atom?
To have the same number of positive and negative charges so that the atom is
neutral.
14. What is the most common element that is found in the atmosphere, earth’s crust,
human body, and ocean water? ____oxygen________________
15. Circle the 6 elements that are most commonly found in the atmosphere, earth’s crust,
human body, and/or ocean water.
iron
mercury
hydrogen
neon
sodium
carbon
calcium
nitrogen
uranium
helium