MEDIUM
8th ICSE
IMPORTANT
Earn 100

The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. Write down its atomic number and its mass number.
 

Important Questions on Atomic Structure

HARD
8th ICSE
IMPORTANT
Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q F
Draw the diagrams representing the atomic structure of the following:
Sodium atom (Atomic number 11; Mass No. 23)
 
MEDIUM
8th ICSE
IMPORTANT
Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q F

Draw the diagrams representing the atomic structure of the following:

Chlorine atom (Atomic number 17; Mass No. 35).

MEDIUM
8th ICSE
IMPORTANT
Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q F

Draw the diagram representing the atomic structure of the following:

Carbon atom (Atomic number 6; Mass No. 12).

MEDIUM
8th ICSE
IMPORTANT
Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q F
What do you understand by isotopes? Give one example.
MEDIUM
8th ICSE
IMPORTANT
Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q F
It is possible to write down the electronic configuration of an atom if we know its atomic number. Why this is so?
 
HARD
8th ICSE
IMPORTANT
Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q F
What would be the electronic configuration of a positively charged sodium ion? What would be its atomic number and mass number.
 
HARD
8th ICSE
IMPORTANT
Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q F
Which of the two would be chemically reactive, element X of atomic number 18 or element Z of atomic number 16? Explain your answer.
HARD
8th ICSE
IMPORTANT
Its All About Science - Chemistry>Chapter 4 - Atomic Structure>Exercise>Q F

The electronic configuration of two elements X and Y are given below

Question Image

where p = proton, n = neutron, e = electron. When these two elements combine together to form a compound, give the mass (in grams) of one mole of this compound.