Elements and Symbols Quiz Study Guide

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

Reading a Periodic Table

How to read an Isotopic Symbol F 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.

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 -11 -11 0 12 X = 12 Neutrons Electrons P + (-e) = Net Charge 11 + X = 1 -11 -11 0 -10 X = -10 electrons

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

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 -5 -5 0 6 X = 6 Neutrons Electrons P + (-e) = Net Charge 5 + X = -3 -5 -5 0 -8 X = 8 electrons

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 = 35 + 45 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

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

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

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 = 59 + 82 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

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

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.