Grade 8- Laroya

Referring to the history of periodic table, who is the German chemist, who formed the triads of elements with similar properties like the triad calcium, barium, and strontium.

• a. Johann Dobereiner

• b. John Newlands

• c.  Lothar Meyer

• d. Dmitri Mendeleev

 

________ is an important tool for understanding the chemical and physical properties of elements.

• a. compound

• b. element

• c. periodic table

• d. isotopes table

According to him similar properties could be noted for every eight elements when they are arranged in in order of increasing atomic mass.

• a.  Johann Dobereiner

• b.  John Newlands

• c.  Lothar Meyer

• d.  Dmitri Mendeleev

The vertical column of the periodic table that signifies the number of valence electrons in an element.

• a. period

• b. family

• c. group

• d. elements’ name

The horizontal rows in the periodic table that signify the number of electron shells in an element.

• a. period

• b. family

• c. group

• d. elements’ name

What element can be found in period 1 and group 1 of the periodic table of elements?

• a. Hydrogen

• b. Helium

• c. Boron

• d. Beryllium

It exhibits both property of metal and non-metal elements.

• a. Metalloids

• b. Metal Ion

• c. Metal Isotopes

• d. Neutral atom

   Which group of elements best conducts electricity?

l

• A.     Metal

• B.     Metalloid

• C.     Noble gas

• D.    Non-metal

   What is the chart that shows classifications of elements according to their properties and increasing atomic numbers?

• A.     Atomic table

• B.     Element table

• C.     Group table

• D.    Periodic table

How are elements arranged in the Periodic Table?

 

• A.     Increasing atomic radii

• B.     Increasing atomic masses

• C.     Decreasing atomic masses

• D.    Increasing atomic numbers