1. Homework from page 104

2. Homework from page 104 Boron has two isotopes. boron-10
mass = amu
abundance = 19.8%
Boron-11
mass = amu
abundance = 80.2%
Calculate its atomic mass.

3. Homework from page 104 (mass x abundance) + (mass x abundance)
boron-10
mass = amu
abundance = 19.8%
Boron-11
mass = amu
abundance = 80.2%

4. Homework from page 104 (mass x abundance) + (mass x abundance)
boron-10
mass = amu
abundance = 19.8%
Boron-11
mass = amu
abundance = 80.2%

5. Homework from page 104 (mass x abundance) + (mass x abundance)
amu
x %
amu
x %

6. Homework from page 104 (mass x abundance) + (mass x abundance)
amu x
amu x

7. Homework from page 104 (mass x abundance) + (mass x abundance)
amu x
1.983
amu x
8.929

8. Homework from page 104 (mass x abundance) + (mass x abundance)
amu x
1.983
amu x
8.829

9. Homework from page 104 (mass x abundance) + (mass x abundance) 1.983

10. Homework from page 104 (mass x abundance) + (mass x abundance) 1.983
amu

11. Homework from page 104 (mass x abundance) + (mass x abundance) 1.983
amu

12. Homework from page 104
Helium has two naturally occurring isotopes, helium-3 and helium-4.
The atomic mass of helium is amu.
Which isotope is more abundant in nature?

13. Homework from page 104
Helium has two naturally occurring isotopes, helium-3 and helium-4.
The atomic mass of helium is amu.
Which isotope is more abundant in nature?

14. Homework from page 104
Calculate the atomic mass of magnesium. Three isotopes are:
mass = amu, abund. = 78.99%
mass = amu, abund. = 10.00%
mass = amu, abund. = 11.01%

15. Homework from page 104 mass = 23.985 amu, abund. = 78.99%
(mass x abundance)
mass = amu, abund. = 78.99%
mass = amu, abund. = 10.00%
mass = amu, abund. = 11.01%

16. Homework from page 104 23.985 x 78.99% 24.986 x 10.00% 25.982 x 11.01%
(mass x abundance)
x 78.99%
x 10.00%
x 11.01%

17. Homework from page 104
(mass x abundance)
x .7899
x .1000
x .1101

18. Homework from page 104 23.985 x .7899 = 18.95 amu
(mass x abundance)
x = amu
x = amu
x = amu

19. Homework from page 104 18.95 amu 2.498 amu + 2.861 amu
(mass x abundance)
18.95 amu
2.498 amu
amu

20. Homework from page 104 18.95 amu 2.498 amu + 2.861 amu 24.31 amu
(mass x abundance)
18.95 amu
2.498 amu
amu
amu

21. Homework from page 104 18.95 amu 2.498 amu + 2.861 amu 24.31 amu
(mass x abundance)
18.95 amu
2.498 amu
amu
amu

22. Homework from page 104
21. Nitrogen has two naturally occurring isotopes, N-14 and N-15.
The atomic mass of nitrogen is amu.
Which isotope is more abundant in nature?

23. Homework from page 104
21. Nitrogen has two naturally occurring isotopes, N-14 and N-15.
The atomic mass of nitrogen is amu.
Which isotope is more abundant in nature?

24. Daily Quiz

25. iron (Fe) silver (Ag) titanium (Ti) platinum (Pt) uranium (U)
Daily Quiz
1. What element has 47 protons?
iron (Fe)
silver (Ag)
titanium (Ti)
platinum (Pt)
uranium (U)

26. magnesium (Mg) beryllium (Be) chromium (Cr) phosphorus (P) carbon (C)
Daily Quiz
2. What element has 12 electrons?
magnesium (Mg)
beryllium (Be)
chromium (Cr)
phosphorus (P)
carbon (C)

27. Daily Quiz
3. How many neutrons are in helium? 1 2 3 4 5

28. Daily Quiz
4. How many protons are in sodium? 1 3 11 12 23

29. Daily Quiz
4. How many electrons are in neon? 1 8 10 18 20

30. Daily Quiz
5. How many neutrons are in carbon? 2 4 6 8 12

31. iron (Fe) silver (Ag) titanium (Ti) platinum (Pt) uranium (U)
Daily Quiz
1. What element has 47 protons?
iron (Fe)
silver (Ag)
titanium (Ti)
platinum (Pt)
uranium (U)

32. iron (Fe) silver (Ag) titanium (Ti) platinum (Pt) uranium (U)
Daily Quiz
1. What element has 47 protons?
iron (Fe)
silver (Ag)
titanium (Ti)
platinum (Pt)
uranium (U)

33. magnesium (Mg) beryllium (Be) chromium (Cr) phosphorus (P) carbon (C)
Daily Quiz
2. What element has 12 electrons?
magnesium (Mg)
beryllium (Be)
chromium (Cr)
phosphorus (P)
carbon (C)

34. magnesium (Mg) beryllium (Be) chromium (Cr) phosphorus (P) carbon (C)
Daily Quiz
2. What element has 12 electrons?
magnesium (Mg)
beryllium (Be)
chromium (Cr)
phosphorus (P)
carbon (C)

35. Daily Quiz
3. How many neutrons are in helium? 1 2 3 4 5

36. Daily Quiz
4. How many protons are in sodium? 1 3 11 12 23

37. Daily Quiz
4. How many electrons are in neon? 1 8 10 18 20

38. Daily Quiz
5. How many neutrons are in carbon? 2 4 6 8 12