1. The mass number of the atom is the total number of &. 2. What are the three particles in an atom and what is each of their charges?
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1 WEDNESDAY, OCT The mass number of the atom is the total number of &. 2. What are the three particles in an atom and what is each of their charges? 3. The symbol for elements is commonly written like the example shown to the right. a. What does the 16 represent? b. What does the 8 represent? c. What is the name of the element? Oct 14 7:06 PM 4. Write the appropriate symbol (like the one above with numbers) for aluminum. 5. Use the Diagram Below to Answer the Following Questions: a. Which element is represented in element X? b. Which element is represented in element Y? c. Which element (if any) has the greater mass number? Oct 14 7:13 PM 1
2 Atoms, Ions, and Isotopes Quick Review Atoms are made up of three particles: PUSH LABEL THE ATOM neutron proton nucleus electron Which of the three particles identifies what element an atom is? 2
3 Proton Review Most of an atom's mass is contained in the nucleus Check out the comparison chart below: PARTICLE SYMBOL MASS RELATIVE MASS Proton p x kg 1 amu Neutron n x kg 1 amu Electron e 9.11 x kg 1/1840 amu Different Forms of the Same Element In any element, the # of protons is always constant Number of electrons and neutrons can vary within an element without changing the identity of the element > Ex. Carbon (C) ALWAYS has 6 protons, but it can have 6 8 neutrons and 2 10 electrons Mass Number can change also > Mass Number = Protons + Neutrons 3
4 Isotopes portal.com/academy/lesson/atomic number and mass number.html#les An ISOTOPE is a form of an element that has a different number of neutrons than normal Carbon has three isotopes: Carbon 12, Carbon 13, Carbon N c Protons and Neutrons Instructions Below you will practice figuring out the different protons, electrons, and neutrons for the table. I have left some open to help you out, but once you have an answer click on the cell shade to reveal the answers. If you need the periodic table click on the animal below to go to the periodic table. Isotope Number of p + Number of e Number of n o Nuclear Symbol Hydrogen 2 1 Helium 3 2 Lithium Li Beryllium 9 4 Boron 11 Previous Next Protons and Neutrons 4
5 IONS An atom usually has a neutral charge That means it has the same number of protons as electrons Remember, a proton has a positive charge and an electron has a negative charge ION an atom that has lost or gained one or more electrons and has become charged either positively or negatively Positive Ions: "CATIONS" When an atom LOSES electrons, it becomes more POSITIVE WHY?? 5
6 Negative Ions: "ANIONS" When an atom GAINS electrons it becomes more NEGATIVE WHY? Representing Ions Ions are represented by placing a superscript charge number next to the atomic symbol Examples > O 2 = oxygen with a negative 2 charge > K + = potassium with a positive 1 charge > N 3 = nitrogen with a negative 3 charge 6
7 Previous Next Isotopes EXAMPLE 1: 1. Neutral Sodium (Na) atoms have protons and electrons with a net charge of. 2. If the Sodium ion gives one electron away, what is the net charge of the ion?. 3. What is the chemical symbol for this ion? 7
8 EXAMPLE 2: 1. Neutral Chlorine (Cl) atoms have protons and electrons with a net charge of. 2. If the Chlorine ion gets one extra electron, what is the net charge of the ion?. 3. What is the chemical symbol for this ion? Examples ISOTOPE ION 134 ION 3 3 ISOTOPE 8
9 Assignment Instructions Drag and drop the appropriate amount of subatomic particles to create the assigned atom. Be sure to note the charge of the atom. Do not press "restart" when done. Proceed to the next slide and create that atom. Mar 19 7:45 AM Li Atom 1: Lithium (+1 ion) 9
10 12 6 C Atom 2: Carbon (neutrally charged) 16 O 2 8 Atom 3: Oxygen ( 2 ion) 10
11 24 Mg Atom 4: Magnesium (+2 ion) 11
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