Download Atomic Structure Worksheet

Science 421
Atomic Structure Worksheet
Name:
1. a. Everything around us is made up of
.
A group of these things are called
.
b. An atom is mainly composed of:
which has a
charge
which has a
charge, and
which has a
charge
2. a. Are the atoms for hydrogen and oxygen identical?
b. Are the atoms for hydrogen identical?
3.
and
are found in the nucleus.
4.
and
have approximately the same mass while
is the lightest of all three. Therefore, most of the mass of an atom is contained
in its
.
5. a. The atomic number is the number of
.
b. The mass number is the number of
and
c. Which one identifies the elements on the periodic table?
6. a. The element carbon is atomic number 6. This means it has
protons and
electrons.
b. An element has 47 protons. How many electrons does it have?
What is the element?
What is its symbol?
7. List the number of protons, neutrons and electrons in each of the following atoms:
Ar
H
Protons
Electrons
Neutrons
8. The element with one more proton than carbon is
Br
O
Cu
Science 421
9. Complete this table:
Symbol
# Protons
Mass #
# Electrons
Atomic #
Se
# Neutrons
45
16
14
8
28
26
7
54
14
O
8
30
15
27
32
10. Draw the following atoms to show the number of electrons in each of their energy levels (orbits). Also write the
electron energy levels using the bracket notation.
a) carbon
b) oxygen
c) neon
d) chlorine
e) argon
f) fluorine
11. Name three elements whose atoms have full outer energy level.
a.
b.
c.
12. Name three elements whose atoms have only one electron in their outer energy level.
a.
b.
c.