Chemistry Exp Na Revision 1
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22 Coral Secondary School Secondary Two Science Chemistry
Name: _______________________________ ( _____________ Revision
Marks
)
Class: _____
Atomic Structure
Multiple Choice Questions 1. The sulphur atom contains 16 protons; this shows that A the atom contains 6 electrons in the outermost shell. B the atom contains 16 neutrons. C sulphur is a metal. D sulphur cannot form a negative ion.
(
)
2. Which one of the following pairs contains particles which have equal and opposite charges? A a proton and a hydrogen ion B a neutron and an electron C a neutron and a hydrogen nucleus D a proton and an electron ( ) 3. Which one of the following particles contains the greatest number of protons? A Mg2+ B Al3+ C P D Cl( ) 4. Which one of the following elements have ions with the same number of electrons as a neon atom? Atomic number Ion A 1 Hydrogen B 11 Sodium C 17 Chlorine ( ) D 19 Potassium 5. Which of the statements is correct for all neutral atoms? A number of protons = number of neutrons B number of protons = number of electrons C number of neutrons = number of electrons D number of neutrons = number of protons + electrons
(
)
6. Which of the following atoms has fewer neutrons than protons in its nucleus? 2 7 11 A B 3 Li C 49 Be D 5B ( ) 3 He 7. The bar chart shows the period of elements from lithium to neon. C B Be Li
N O F
Ne
Sec 2 Chem 2009/Atomic Structure/ Revision Worksheet/HUD
Page 1 of 4
Date:
Which property of these elements is shown on the charts? A number of electrons used in bonding B number of orbits holding the electrons C number of nucleons D number of protons
(
)
(
)
8. The table shows information about ions Q and R. Protons Neutrons Electrons Q 16 16 18 R 17 18 18 What are Q and R? A negative ions of different elements B negative ions of the same element C positive ions of different elements D positive ions of the same element Structured and Free-response Questions 1. Atoms of beryllium and magnesium are represented below: 9 24 4 Be 12 Mg a. What do these numbers tell you about each atom? i. 4 (for Be) ……………………………………………………………………………………… ii. 24 (for Mg) ……………………………………………………………………………………… b. i. Write the electronic configuration of an atom of magnesium. ……………………………………………………………………………………… ii. In which group is magnesium placed? ……………………………………………………………………………………… c. How do the structures of beryllium and magnesium indicated they are in the same Group of the Periodic Table? ……………………………………………………………………………………… ………………………………………………………………………………………
Sec 2 Chem 2009/Atomic Structure/ Revision Worksheet/HUD
Page 2 of 4
2. The ion of element X contains twelve protons, twelve neutrons and ten electrons. a. Which particles in this ions have i. a positive charge? ……………………………………….. ii. no charge?
…………………………………………
b. What is the nucleon number of this ion? …………………………….. c. Identify element X.
……………………………..
d. Write the chemical symbol for this ion.
……………………………
e. Draw the atom of element X showing the arrangement of electrons in the atom.
3. The nuclei of five different atoms, F, G, H, I and J, are shown below. (These letters are not the chemical symbols)
a. Which atom has a nucleon number of 6? ............................................................................................................................ b. Which two atoms have three electrons in their outermost shell? ............................................................................................................................ c. Which atoms are isotopes? Provide a reason for your answer. ............................................................................................................................ ............................................................................................................................ d. Which atom is an isotope of hydrogen? ............................................................................................................................
Sec 2 Chem 2009/Atomic Structure/ Revision Worksheet/HUD
Page 3 of 4
4. Uranium is used in nuclear reactors. A sample of uranium is found to consist of two isotopes. a. Define isotopes. ……………………………………………………………………………………………… ……………………………………………………………………………………………… b. Complete the table below which describes the two isotopes of uranium. Isotope Uranium-235 Uranium-233
Number of protons Number of in each atom neutrons in each atom 92 143
Symbol of isotope
5. Boron is used to make control rods for a nuclear reactor. Naturally occurring 10 11 boron contains atoms represented by the symbols 5 B and 5 B . a. Draw a diagram of the electronic structure of a boron atom.
b. Suggest why the relative atomic mass of naturally occurring boron is not a whole number. ……………………………………………………………………………………………… ………………………………………………………………………………………………
Sec 2 Chem 2009/Atomic Structure/ Revision Worksheet/HUD
Page 4 of 4
Name: _______________________________ ( _____________ Revision
Marks
)
Class: _____
Atomic Structure
Multiple Choice Questions 1. The sulphur atom contains 16 protons; this shows that A the atom contains 6 electrons in the outermost shell. B the atom contains 16 neutrons. C sulphur is a metal. D sulphur cannot form a negative ion.
(
)
2. Which one of the following pairs contains particles which have equal and opposite charges? A a proton and a hydrogen ion B a neutron and an electron C a neutron and a hydrogen nucleus D a proton and an electron ( ) 3. Which one of the following particles contains the greatest number of protons? A Mg2+ B Al3+ C P D Cl( ) 4. Which one of the following elements have ions with the same number of electrons as a neon atom? Atomic number Ion A 1 Hydrogen B 11 Sodium C 17 Chlorine ( ) D 19 Potassium 5. Which of the statements is correct for all neutral atoms? A number of protons = number of neutrons B number of protons = number of electrons C number of neutrons = number of electrons D number of neutrons = number of protons + electrons
(
)
6. Which of the following atoms has fewer neutrons than protons in its nucleus? 2 7 11 A B 3 Li C 49 Be D 5B ( ) 3 He 7. The bar chart shows the period of elements from lithium to neon. C B Be Li
N O F
Ne
Sec 2 Chem 2009/Atomic Structure/ Revision Worksheet/HUD
Page 1 of 4
Date:
Which property of these elements is shown on the charts? A number of electrons used in bonding B number of orbits holding the electrons C number of nucleons D number of protons
(
)
(
)
8. The table shows information about ions Q and R. Protons Neutrons Electrons Q 16 16 18 R 17 18 18 What are Q and R? A negative ions of different elements B negative ions of the same element C positive ions of different elements D positive ions of the same element Structured and Free-response Questions 1. Atoms of beryllium and magnesium are represented below: 9 24 4 Be 12 Mg a. What do these numbers tell you about each atom? i. 4 (for Be) ……………………………………………………………………………………… ii. 24 (for Mg) ……………………………………………………………………………………… b. i. Write the electronic configuration of an atom of magnesium. ……………………………………………………………………………………… ii. In which group is magnesium placed? ……………………………………………………………………………………… c. How do the structures of beryllium and magnesium indicated they are in the same Group of the Periodic Table? ……………………………………………………………………………………… ………………………………………………………………………………………
Sec 2 Chem 2009/Atomic Structure/ Revision Worksheet/HUD
Page 2 of 4
2. The ion of element X contains twelve protons, twelve neutrons and ten electrons. a. Which particles in this ions have i. a positive charge? ……………………………………….. ii. no charge?
…………………………………………
b. What is the nucleon number of this ion? …………………………….. c. Identify element X.
……………………………..
d. Write the chemical symbol for this ion.
……………………………
e. Draw the atom of element X showing the arrangement of electrons in the atom.
3. The nuclei of five different atoms, F, G, H, I and J, are shown below. (These letters are not the chemical symbols)
a. Which atom has a nucleon number of 6? ............................................................................................................................ b. Which two atoms have three electrons in their outermost shell? ............................................................................................................................ c. Which atoms are isotopes? Provide a reason for your answer. ............................................................................................................................ ............................................................................................................................ d. Which atom is an isotope of hydrogen? ............................................................................................................................
Sec 2 Chem 2009/Atomic Structure/ Revision Worksheet/HUD
Page 3 of 4
4. Uranium is used in nuclear reactors. A sample of uranium is found to consist of two isotopes. a. Define isotopes. ……………………………………………………………………………………………… ……………………………………………………………………………………………… b. Complete the table below which describes the two isotopes of uranium. Isotope Uranium-235 Uranium-233
Number of protons Number of in each atom neutrons in each atom 92 143
Symbol of isotope
5. Boron is used to make control rods for a nuclear reactor. Naturally occurring 10 11 boron contains atoms represented by the symbols 5 B and 5 B . a. Draw a diagram of the electronic structure of a boron atom.
b. Suggest why the relative atomic mass of naturally occurring boron is not a whole number. ……………………………………………………………………………………………… ………………………………………………………………………………………………
Sec 2 Chem 2009/Atomic Structure/ Revision Worksheet/HUD
Page 4 of 4
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