CHAPTER 4 - THE PERIODIC TABLE

Which of the following statement explain why the reactivity of Group 17 elements decreases when going down the group?

• The physical state of the elements changes from gas to liquid then to solid at room temperature

• The attractive force between valence electron and nucleus become weaker

• The valence electron gets nearer to the nucleus

• The melting point of the element decrease

Atom of element X has a proton number of 13. Where is X located in the Periodic Table of Elements?

• A

• B

• C

• D

Elements in the periodic Table are arranged according to an increase in

• proton number

• nucleon number

• relative atomic mass

• relative molecular mass

Which of the following is a monoatomic gas?

• Oxygen

• Fluorine

• Helium

• Nitrogen

What is the meaning of electronegativity?

• The ability of ion to lose electron

• The ability of ion to gain electron

• The ability of atom to lose elctron

• The ability of atom to gain electron

Group 17 elements form

• +1 ion

• -1 ion

• +7 ion

• -7 ion

Reactivity of halogen decreases going down the group because

• The 8th electron difficult to attract by neucleus

• Electrons are closer to the nucleus

• Atomic size decreases down the group

• Screening effect decrease

Which of these period 3 elements has the highest boiling point?

• Phosphorus

• Sulphur

• Aluminium

• Sodium

The period is the rows of elements in the periodic table

• Horizontal

• Vertical

What is the special characteristic of transition elements?

• Do not have catalytic properties

• Have one oxidation state

• Cannot form complex ions

• Form coloured compounds and ions in solute