Content Standard 1



Yüklə 30,35 Kb.
tarix02.03.2018
ölçüsü30,35 Kb.
#29253

Teacher Notes

Name Key Class Date

Atomic Structure

Subatomic Particles in Neutral Atoms

The table below contains information about several isotopes. Use the information given to fill in the blanks. Assume all atoms are neutral.



Isotope

Name

Nuclear Symbol

Atomic Number

Mass Number

# of Protons

# of Neutrons

# of Electrons

  1. calcium-40



20

40

20

20

20

  1. iron-56



26

56

26

30

26

  1. oxygen-18



8

18

8

10

8

  1. gold-197



79

197

79

118

79

Subatomic Particles in Ions

The table below contains information about several ions. Use the information given to fill in the blanks.



Element

Name

Ion Symbol

Atomic Number

Mass Number

# of Protons

# of Neutrons

# of Electrons

  1. chlorine

Cl

17

35

17

18

18

  1. silver

Ag +

47

107

47

60

46

  1. oxygen

O 2

8

16

8

8

10

  1. aluminum

Al 3+

13

27

13

14

10

Average Atomic Mass

  1. Calculate the average atomic mass for neon if its abundance in nature is 90.5% neon-20, 0.3% neon-21, and 9.2% neon-22.

(90.5)(20 amu) + (0.3)(21 amu) + (9.2)(22 amu)

= 20.18 amu

100







  1. Calculate the average atomic mass of silver if 13 out of 25 atoms are silver-107 and 12 out of 25 atoms are silver-109.

(13)(107 amu) + (12)(109 amu)

= 107.96 amu

25







Reviewing Concepts

  1. The mass of an atom is contained mainly in its protons and neutrons .




  1. The identity of an element is determined by its number of protons .




  1. Isotopes are atoms with the same number of protons and different number of neutrons .




  1. The charge of an atom or ion is determined by its number of electrons .




  1. B Particle X contains 9 protons, 10 neutrons, and 9 electrons. Particle Y contains 9 protons, 10 neutrons, and 10 electrons. What is the relationship between particles X and Y?

      1. Particles X and Y are isotopes of the same element.

      2. Particle X is an atom, and particle Y is an ion of the same element.

      3. Particle X and Y are atoms of different elements.

      4. There is no significant difference between particles X and Y.




  1. Briefly explain your answers to question 15.


Same number of protons = same element. Same number of neutrons = same isotope. Different number of electrons = different charge. X is a neutral atom. Y is a negative ion.



Yüklə 30,35 Kb.

Dostları ilə paylaş:




Verilənlər bazası müəlliflik hüququ ilə müdafiə olunur ©genderi.org 2022
rəhbərliyinə müraciət

    Ana səhifə