Unit 1.3
Questions
Katie Cothran
Science
1) Explain why the protons and neutrons are less likely than electrons to be affected by
a chemical reaction.
This is because protons and neutrons are the same. Electrons are also not bound to the
nucleus of the atom like the proton and the neutron.
2) What are energy levels?
Energy levels are the maximum amount that each shell can obtain.
3) How many electrons can each shell hold?
k=2 , L=18 ,M=18 ,N=32
4) What does the electron configuration of an atom show?
The electronic configuration shows the atom number and how for each of the specified
atoms can be later categorized as a Nobel /inert gas.
5) Write the electron configuration for:
a) Silicon (Si) _ k= 2 , L=8 & M= 4
b) helium (He) _ K= 4 & L=2
c) Nitrogen (N) _ K=2 & L=5
d) Argon (Ar) _ K=2 , L=8 & M= 8
6) What is an element’s group number the same as?
An elements group number is the same as
7) What period would an atom be in if it has electrons in
three electron shells?
b) period 2
8) What group and period would these atoms be in?
a) 2,8,7 = period 3 & group 7
b ) 2,5 = period 2 & group 5
9) Why do atoms in the same group have similar chemical properties ?
- with an accept ions they have the same valence electron.
10)what are 2 other names for noble gases?
a) inert gases
b) stable gases
11) list symbols for elements in group VIII
a) helium
b) neon
c) argon
d) krypton
e) radon
12) Why are Group VIII atoms so stable and unreactive?
This is because they are Noble gases / inert.
13)
Atoms are electrically neutral because the number of protons equals the number of
electrons, balancing the positive and negative charges. If this balance is changed then
an atom becomes charged and is called an ion. Ions form in a chemical reaction
because electrons move from atom to atom.
14) noble gases do not form ions because they all have the same number from the first
20, also ions need to have an atom that is charged to create an ion.
15) If a sodium atom meets a chlorine atom, the sodium loses its outer-shell electron to
form the sodium ion Na+
16) If an atom gains electrons then it becomes a negative ion.
17)
This is because Both ions are more stable than the neutral atoms from which they
were formed, and exist as NaCl, sodium chloride (common salt).
18) neutrons are changing.
19) Don’t understand, do with Mr. Malay.
20)
What would be the electron configuration of these atoms?
a
an atom in Period 2, Group VI= Florine [ F]
b
an atom in Period 3, Group VIII = Argon [Ar]
c
an atom of Period 1, Group VIII = Helium [He]
d
an atom of Mg= group VIII, Period 3 = Magnesium
e
an atom of S = Group VIII, Period 2= Sulphur
21)
A)
B)
C)
D)
E)
F)
G)
H)
an atom with eight protons = 8 electrons
an atom with eighteen protons= 18
an atom with an atomic number of 3= 2
an atom with an atomic number of 7= 7
an atom in Period 2, Group VII = Copper
an atom in Period 3, Group II = Magnesium
an atom of phosphorus = Lithium
an atom of aluminum= Lead
22)
a) oxygen [ 2 &6]
b) Argon { 2 ,8,8]
c) lithium[2 ,1]
d) Nitrogen [ 2 ,5]
e) Florine [2 6 1]
f) Magnesium [ 2 8 2]
g) Lithium { 2 8 5}
h)Lead { 2 8 10}
23)
question: What period and group would these atoms belong to?
a)An atom with configuration 2,4 = period 2 group 14
b)An atom with configuration 2,8,6= period 3 group 16
c)An atom with 7 electrons= period 2 group 15
d)An atom with 15 electrons= period 3 group 15
e Ca = period 4 group 2
f Ne= period 2 group 18 ( inert gas)
24)
#protons
#neutrons
#electrons
8
6
8
10
10
10
11
10
10
17
16
18
15
15
18
19
18
20
19
8
7
Overall charge Atom/ion
10
Finish table in class when correcting work ^^^^^^^^.
symbol
Neon Ne