Question
Three properties of element X are listed.
● It contains atoms with a full outer shell of electrons.
● It is monoatomic.
● It is unreactive.
In which part of the Periodic Table is the element placed?
A. Group I
B. Group VII
C. Group VIII
D. transition elements
Answer/Explanation
Ans:
C
Question
Which diagram represents the arrangement of the outer-shell electrons of a noble gas?
Answer/Explanation
Ans:
A
Question
Why is helium used to fill balloons?
A Helium is monoatomic.
B Helium is in Group VIII of the Periodic Table.
C Helium has a full outer electron shell.
D Helium is less dense than air.
Answer/Explanation
Ans: D