Home
Videos uploaded by user “FuseSchool - Global Education”

03:18

01:55

04:08

02:32

04:15

03:08

03:57

04:06

03:50

04:19

02:55

04:12

04:14

02:28

05:11

03:56

04:05

04:31

03:43

04:12

02:36

02:53

03:14

03:23

04:04

02:51
What are Isotopes? Find out in this video from the Properties of Matter chapter. 00:00:02,590 -- 00:00:07,319 In a previous video we learnt about Isotopes. Here are a few more examples. 00:00:07,319 -- 00:00:14,319 There are two isotopic forms of Chlorine: Chlorine 35 and Chlorine 37. Remember isotopes 00:00:16,910 -- 00:00:21,869 have the SAME number of protons, but a different number of neutrons. So how 00:00:21,869 -- 00:00:27,090 many neutrons are in each of these isotopic forms of Chlorine? 00:00:27,090 -- 00:00:30,980 Remember: Mass Number = Number of Protons + Number of 00:00:30,980 -- 00:00:34,030 Neutrons. And the number of protons for each isotope forms 00:00:34,030 -- 00:00:39,960 of elements is the same, so we can rearrange this formula to calculate the number of neutrons 00:00:39,960 -- 00:00:44,969 in each form. Neutrons = Mass Number - Protons 00:00:44,969 -- 00:00:51,969 When we look at Chlorine on the periodic table it has an atomic number of 17, therefore it 00:00:55,149 -- 00:00:59,860 has 17 protons. So Chlorine-35 has a mass of 35. 00:00:59,860 -- 00:01:04,480 Neutrons = Mass Number - Protons = 35 -17 00:01:04,480 -- 00:01:06,909 = 18 18 neutrons 00:01:06,909 -- 00:01:13,909 So Chlorine-37 has a mass of 37. Neutrons = Mass Number - Protons 00:01:15,360 -- 00:01:18,929 = 37 -17 = 20 00:01:18,929 -- 00:01:24,590 20 neutrons. So Chlorine-35 has 18 neutrons and Chlorine 00:01:24,590 -- 00:01:25,999 37 has 20 neutrons. 00:01:25,999 -- 00:01:32,999 Another example of an isotope is Lithium. Lithium has two stable isotopic forms. 00:01:33,340 -- 00:01:38,619 The atomic number of Lithium is 3, therefore it has 3 protons. 00:01:38,619 -- 00:01:43,450 The isotopes of Lithium have 3 neutrons and 4 neutrons respectively. 00:01:43,450 -- 00:01:48,729 How do we calculate each of the isotopes mass number? 00:01:48,729 -- 00:01:52,349 Remember, Mass Number = Number of Protons + Number of 00:01:52,349 -- 00:01:56,209 Neutrons. So for one isotopic form the mass number would 00:01:56,209 -- 00:02:00,059 be: 3 + 3 = 6 00:02:00,059 -- 00:02:04,489 So we would have Li-6 And for the other form, the mass number would 00:02:04,489 -- 00:02:05,599 be 3+4 = 7 00:02:05,599 -- 00:02:09,580 So we would have Li- 7 Want to learn more? Visit: www.fuseschool.org This video is distributed under a Creative Commons License: Attribution-NonCommercial-NoDerivs CC BY-NC-ND

02:20

03:52

04:06

04:58

04:45

03:34

02:08

04:42

04:17

05:54

03:28

04:51

04:32

03:15

03:56

03:14

03:46

03:04

04:54

04:05

03:51

04:20