MEDIUM
Lower Secondary Stage 9
IMPORTANT
Earn 100

Caesium is in Period 6 in Group 1. Would you expect caesium to have a higher or lower melting point than rubidium? Give a reason for your answer.

Important Questions on The Periodic Table

EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>Exercise 10>Q 11
Write the word equation for the reaction between hydrogen and chlorine.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>Exercise 10>Q 12
Astatine is the element below iodine in group 7. Would you expect astatine to be more or less reactive than iodine? Give a reason for your answer.
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>Exercise 13>Q 13
Why did Mendeleev's periodic table contain fewer elements than the one we use today?
HARD
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>Exercise 13>Q 14

Answer the following questions:

a) What question was Mendeleev trying to answer? 
b) What evidence did he use? 
c) How did Mendeleev think creatively? 
d) What new evidence supported Mendeleev's ideas?

EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>End of Chapter Review>Q 1
What charge does a proton have? 
EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>End of Chapter Review>Q 2
A potassium atom has atomic number 19 and mass number 39. How many electrons does it have? 
EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>End of Chapter Review>Q 3
What two particles are found in the nucleus of an atom? 
EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 5 - The Periodic Table>End of Chapter Review>Q 4
What word completes this sentence? 
Elements in the same _____ in the Periodic Table share similar properties.