GRADE 8

What is the mass number of Holmium?

• 172

• 190

• 165

• 115

How many neutrons does Protactinium have?

• 144

• 140

• 142

• 147

What is the group number of Rhodium?

• 9

• 11

• 14

• 7

Nitrogen group in the Periodic Table of Elements is also known as?

• Tetrels

• Chalcogen

• Pnicogen

• Pnictogen

What is the metallic classification of Te?

• Non-metal

• Metalloids

• Metals

• Halogens

What is the number of protons of Tc?

• 25

• 49

• 43

• 29

In what year did Antoine Lavoisier create groups for substances that have the same physical characteristics?

• 1897

• 1798

• 1879

• 1789

He compared the arrangement of the chemicals in the periodic table to music?

• Lothar Meyer

• John Newlands

• Antoine Lavoisier

• Dmitri Mendeleev

What does the horizontal rows in the periodic table of the elements represent?

• period

• group

• families

• cluster

Which of the following set of elements are accurately grouped?

• O, S, Se, Ar

• H, Li, Mg, Sc,

• B, Al, Ga, In

• C, P, Se, I