1. Elements and Symbols Quiz Study Guide

2. Latin Words – know these words
Micro – small
Saccharum – sugar
Macro – large
Ose – having a specified quality
Iso – same
Co – together
Topes – place
Ad – to others
Poly – many
Pole – end of an axis
Mono – one

3. Reading a Periodic Table

4. How to read an Isotopic SymbolF 19 9
Flourine Isotopyic Symbol X A Z
Typical Isotopyic Symbol C
X = Element Symbol A = Mass Number
Z = Atomic Number C = Net Charge
A = Mass Number: The mass number is the weight of an element. It is found by adding the protons and neutrons together. A simple equation can be used to find the mass number. P + N = Mass Number
Z = Atomic Number: The atomic number is simply the number of protons.
C = Net Charge: Net charge tells us whether or not an atom has a positive charge or a negative charge. You can find the charge by adding the protons and electrons together. A simple equation can be used to find the net charge. P + (-e) = net charge. Remember: protons are always positive numbers and electrons are always negative.

5. Taking apart an Isotopic Symbol Walkthrough
Step 1: Find your atomic number to find the number of protons.
Step 2: Use your mass number formula to find your neutrons.
P + N = Mass Number
Step 3: Use your net charge formula to find your electrons.
P + (-e) = Net Charge
Answer:
P = 11
N = 12
E = 10 Na 23 11 +
Mass Number
Atomic Number
Electrons are always negative numbers, so its not necessary to write put a negative in your answer.
Neutrons:
P + N = Mass Number
11 + X = 23
X = 12 Neutrons
Electrons
P + (-e) = Net Charge
11 + X = 1
X = -10 electrons

6. Taking apart an Isotopic Symbol: Practice
Step 1: Find your atomic number to find the number of protons.
Step 2: Use your mass number formula to find your neutrons.
P + N = Mass Number
Step 3: Use your net charge formula to find your electrons.
P + (-e) = Net Charge
Answer:
P = 11
N = 12
E = 10 B 11 5 -3
Mass Number
Atomic Number
Electrons are always negative numbers, so its not necessary to write put a negative in your answer.
Neutrons:
P + N = Mass Number
Electrons
P + (-e) = Net Charge

7. Taking apart an Isotopic Symbol: Answer
Step 1: Find your atomic number to find the number of protons.
Step 2: Use your mass number formula to find your neutrons.
P + N = Mass Number
Step 3: Use your net charge formula to find your electrons.
P + (-e) = Net Charge
Answer:
P = 5
N = 6
E = 8 B 11 5 -3
Mass Number
Atomic Number
Electrons are always negative numbers, so its not necessary to write put a negative in your answer.
Neutrons:
P + N = Mass Number
5 + X = 11
X = 6 Neutrons
Electrons
P + (-e) = Net Charge
X = -3
X = 8 electrons

8. Building an Isotopic Symbol: Walkthrough
Step 1: Find and write your symbol using the number of protons*.
Step 2: write the number of protons on the left bottom side of your symbol.
Step 3: Find your mass number by adding your protons and neutrons together. X A Z
Typical Isotopyic Symbol C
A bromine atom with 45 neutrons and 38 electrons.
*There are many ways to find your protons. In this case you will look up Bromine on your periodic table to find the atomic number.
Mass Number = P + N
X =
X = 80
Step 4: write your mass number above your proton number on the upper left side of your symbol.
Step 5: Find your electrons using
P+ e = net charge
Step 6: Write your net charge on the upper right hand side of your symbol. Br 80 35
Answer -3
Net Charge = P + (-e)
X = 35 + (-38)
X = -3

9. Building an Isotopic Symbol: Walkthrough
Step 1: Find and write your symbol using the number of protons*.
Step 2: write the number of protons on the left bottom side of your symbol.
Step 3: Find your mass number by adding your protons and neutrons together. X A Z
Typical Isotopyic Symbol C
Net Charge
An atom that has 59 protons and 82 neutrons.
Mass Number
Atomic Number
*There are many ways to find your protons. In this case you will look up Bromine on your periodic table to find the atomic number.
Mass Number = P + N
Step 4: write your mass number above your proton number on the upper left side of your symbol.
Step 5: Find your electrons using
P+ e = net charge
Step 6: Write your net charge on the upper right hand side of your symbol. Br 80 35
Answer -3
Net Charge = P + (-e)
X = 35 + (-38)
X = -3

10. Building an Isotopic Symbol: Practice
Step 1: Find and write your symbol using the number of protons*.
Step 2: write the number of protons on the left bottom side of your symbol.
Step 3: Find your mass number by adding your protons and neutrons together. X A Z
Typical Isotopyic Symbol C
An isotope that has 59 protons and 82 neutrons. And 55 electrons
*There are many ways to find your protons. In this case the atomic number 59 to find your symbol.
Mass Number = P + N
Step 4: write your mass number above your proton number on the upper left side of your symbol.
Step 5: Find your electrons using
P+ e = net charge
Step 6: Write your net charge on the upper right hand side of your symbol.
Net Charge = P + (-e)
Answer

11. Building an Isotopic Symbol: Practice
Step 1: Find and write your symbol using the number of protons*.
Step 2: write the number of protons on the left bottom side of your symbol.
Step 3: Find your mass number by adding your protons and neutrons together. X A Z
Typical Isotopyic Symbol C
An isotope that has 59 protons and 82 neutrons. And 55 electrons
*There are many ways to find your protons. In this case the atomic number 59 to find your symbol.
Mass Number = P + N
X =
X = 141
Step 4: write your mass number above your proton number on the upper left side of your symbol.
Step 5: Find your electrons using
P+ e = net charge
Step 6: Write your net charge on the upper right hand side of your symbol. +4 Pr
Net Charge = P + (-e)
X = 59 + (-55)
X = +4
141 59
Answer

12. Balanced Atoms, Isotopes and Ions: Know the difference!
Balanced Atom = Equal Number of Protons, Neutrons and Electrons
Isotopes = An atom that has more or less neutrons than protons
Ion = An atom that has more or less electrons than protons.
Anion: More Electrons than Protons
Cation: Less Electrons than Protons

13. Mass Number and Atomic Mass
Mass Number = The weight of one atom or isotope of an element. This weight is found by adding the Protons and Neutrons in an atom or isotope together. P + N = Mass Number
Atomic Mass = The average weight of all atoms and isotopes of an element. This average weight is found by finding the percent abundance of each isotope and then multiplying the weight of the isotope by the percent abundance. Add up the sums for each isotope to get the atomic mass. You can find the atomic mass on the periodic table of elements.