Name: _____________________________
Per:______
Date:__________
Numerically Describing Atoms
Fill in the graphic organizers for both isotopes and ions
Isotope
Ions
Answer the following questions:
1. How many protons and electrons are in a
vanadium atom?
7. How many protons, neutrons and electrons
are present in the 136 C-4 ion?
2. How many protons and electrons are present
in a nitrogen atom?
3. How many protons and electrons are present
in an argon atom?
8. Write the isotopic symbol for the ion with
84 protons, 125 neutrons and 80 electrons.
4. How many protons and electrons are present
in a potassium atom?
9. Write the isotopic symbol for the ion with
27 protons, 32 neutrons and 25 electrons.
5. How many protons and electrons are present
in a platinum atom?
10. Write the isotopic symbol for the ion with
31 protons, 39 neutrons and 28 electrons.
6. How many protons, neutrons and electrons
+3
are present in the 45
21Sc ion?
Complete the following table:
isotopic
symbol
1
2
63
29
Cu
atomic
number
mass
number
8
15
protons
electrons
neutrons
charge
+
3
-2
24
4
25
5
26
13
23
27
10
13
10
cation
or
anion?
Hyphen notation
Is this atom
an isotope
ion or both
Determine the average atomic mass of the following mixtures of isotopes.
_________________________________________________________________________________
127
1. 80.% 53 I , 17%
126
53 I ,
3%
128
53 I
______________________________________________________________________
2. 50.% Gold - 197, 50.% Gold - 198
______________________________________________________________________
55
3. 15% 26
Fe , 85% 56
26 Fe
______________________________________________________________________
4. 99% 11 H , 0.8% 21 H , 0.2% 31H
______________________________________________________________________
5. 95% Nitrogen with 7 neutrons, 3%Nitrogen with 8 neutrons, 2% nitrogen with 9 neutrons
______________________________________________________________________
6. 98% 126 C , 2% 146 C
______________________________________________________________________
7. U-234 (0.0058%),U-235 (0.71%), and U-238 (99.23%).
Indicate the charge (+1, -1, etc) on the ions that are formed in the following situations. Record the resultant
ion as a cation or anion.
Charge
Cation/Anion
a. Lithium loses 1 electron
_____________
_______________
b. Oxygen gains 2 electrons
_____________
_______________
c. Magnesium loses 2 electrons
_____________
_______________
d. Nitrogen gains 3 electrons
_____________
_______________
Fill in the blanks:
The average atomic mass of beryllium is 9.012AMU. This means most common beryllium isotope has:
with ________________ p+ &
a mass of _________________
________________ n0
The average atomic mass of cesium is 132.905AMU. This means most common Cs isotope has:
with ________________ p+ &
a mass of _________________
________________ n0
Are other isotopes of Cs lighter or heaver? How do you know
The average atomic mass of copper is 63.54 AMU. This means that in any penny half the copper atoms weigh
___________________AMU while the other half weigh _____________________________AMU. However
all the copper atoms in existence have ________________ p+
Think about it:
Draw what you think would happen if you passed the three types of radiation between a positively and
negatively charged plate. Which way would the 2 particles and 1 ray bend if any, and how much would each of
them bend?
+
-