Grade 9 - Material Properties

As there are same number of electrons and protons in an atom, atomic number can also be called…

• electron number

• proton number

• nucleon number

• mass number

The smallest atom in 'periodic table' yet found is

• Hydrogen

• Helium

• Lithium

• Magnesium

Atoms of different elements differ from each other because of…

• Difference in color.

• Difference in size.

• Difference in shape

• Difference in particle numbers.

Atoms of elements that are in the same group have the same number of

• protons.

• electrons in the outer shell.

• neutrons

• protons and neutrons

Which of the following is alkali metal?

• Calcium

• Magnesium

• Mercury

• Sodium

Which of the following alkali metal is have the highest

melting point?

• Lithium

• Sodium

• Potassium

• Rubidium

Most metal such as those elements in Group 1 are…

• Occur naturally in gas form

• Liquid on room temperature

• Shiny and good conductors

• Low in boiling and melting point than nonmetals

Which of the following is not the properties of Group 1?

• When dissolved in water, it produces alkaline solution.

• Occur in solid form

• Have higher boiling point than non-metals

• Good insulator.

Which of the following not the elements of Group 7?

• Fluorine

• Chlorine

• Manganese

• Bromine

Which of the following is NOT the properties of Group 7?

• Relatively low boiling point than metal.

• Occurs in different color.

• Comes in either solid, liquid or gas form

• Shiny and good conductors