LESSON05_EVALUATE

How did Dmitri Mendeleev organize the chemical elements?

• by the number of its electrons

• by increasing atomic weight and similar properties

• by increasing atomic number and similar properties

• by the number of its valence electrons

What do you call the rows of chemical elements of the periodic table?

• branch

• class

• group

• period

What is the other name for the family of the periodic table?

• branch

• class

• group

• period

Which of these elements is classified as metalloid?

• Ca

• Cl

• Si

• Zn

What do elements in the same period have in common?

• similar symbols

• gradually changing properties

• the same number of neutrons

• similar chemical properties

Which of the following statements is TRUE about metals?

• metals are poor conductors of heat

• metals are located on the right side of the periodic table

• there are 88 elements of the periodic table classified as metals

• Carbon, Oxygen and Fluorine are examples of metals

Which of the following sets of elements all belongs to metalloids?

• B, Ge, Te, Sb

• F, Cl, Te, I

• Na, Hg, Br, Si

• Bi, Ga, As, Au

How many periods are there in the periodic table of elements?

• 5

• 6

• 7

• 8

Who among the scientists have arranged the periodic table according to its 

atomic number?

• Dobereiner

• Mendeleev

• Meyer

• Moseley

Which of the following sets of elements are classified as non-metals?

• Li, Mg, Ca, K

• O, S, P, Cl

• Pt, Co, Au, Hg

• Si, Ge, As, B