Atom and Outer-shell Electrons Essay example

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Name: _______________________ Class: __________ Date: _______
Instructions: Write answers in the right-hand column. Score: ____________ / 71 marks

Section A—Multiple choice (21 marks)

1
Hydrogen peroxide:
A is water
B has one more hydrogen atom than water
C has one more oxygen atom than water
D is none of the above.

C
1
2
The atomic number of an element is equal to the number of:
A electrons and neutrons
B protons
C neutrons
D protons, neutrons and electrons.

B
1
3
Which one of the following is not a property of non-metals? Non-metals are:
A normally gases or liquids at room temperature
B either poor electrical conductors or non-conductors
C able to be hammered into sheets
D dull, with little or no shine.

C
1
4
The atomic number of zinc (Zn) is 30. Therefore, the ion represented by the symbol 65Zn2+ has:
A 30 protons, 35 neutrons and 28 electrons
B 65 protons, 30 neutrons and 32 electrons
C 30 protons, 65 neutrons and 28 electrons
D 30 protons, 35 neutrons and 32 electrons.

A
1
5
An atom of chlorine (Cl) has 17 protons, 18 neutrons and 17 electrons. Which of the following statements is incorrect about the atom of chlorine?
A It has an atomic number of 17.
B The atom would have no overall electrical charge.
C It would be in Period VII.
D It would be in Period 3.

C
1
6
Use the periodic table to determine which of the following statements is incorrect about chlorine atoms.
A They form the ion Cl–.
B Chlorine atoms are smaller than fluorine atoms.
C They are ‘related’ to F, Br and I.
D Chlorine belongs to the halogen family.

B
1
7
A compound forms when:
A two or more elements chemically combine with each other
B two or more elements are physically mixed together
C a large number of identical atoms join together
D a mixture is separated into its components.

A
1
8
The vertical columns in the periodic table are known as:
A periods, and they contain elements with the same number of outer-shell electrons
B periods, and they contain elements with the same number of used electron shells
C groups, and they contain elements with the same number of outer-shell electrons
D groups, and they contain elements with the same number of used electron shells.

C
1
9
An atom of calcium has 20 electrons. Its electron configuration would best be written as:
A Ca B 20 C 2,8,8,2 D 2,8,10.

C
1
10
The electron configuration of an element in Period 3, Group IV of the periodic table is:
A 2,8,6 B 2,8,8,3 C 2,8,18,3 D 2,8,4.

D
1
11
In the flame colour experiment, different metallic salts gave out different colours when placed in a Bunsen burner flame. This was because:
A the heat from the Bunsen burner caused the electrons to jump to another shell. Coloured light emerged when they jumped back
B the heat from the Bunsen burner caused the electrons to make colours
C the electrons moved very fast around the nucleus
D the light came from the Bunsen burner.

A
1
12
A particular element is shiny, malleable and a good conductor of electricity. Which section of the periodic table would this element not be found in?
A transition elements B Group I
C Group III D Group VII

D
1
13
Which of the following is not a physical property of an element?
A melting point B colour
C reactivity with oxygen D density

C
1
14
Which of the following lists contains only compounds?
A water (H2O), glucose (C6H12O6), carbon dioxide (CO2)
B tungsten (W), phosphorus (P), chlorine (Cl2)
C Vegemite, limewater (Ca(OH)2), plutonium (Pu)
D salt (NaCl), air, iron (Fe)

A
1
15
Moving down Group VII in the periodic table, which property would be expected to decrease?
A the reactivity
B the number of outer-shell electrons in each atom
C the size of atoms
D the melting point

A
1
16
In 1869, Mendeleev devised a periodic table. Which of the following did Mendeleev not do in his periodic table?
A Predict properties of undiscovered
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