Grade 9/ Chemistry/ICSE/ Topic: Atomic structure and Chemical bonding.

Grade 9

Subject: Chemistry

Topic: Atomic structure and Chemical bonding

Marks:40

Question 1

Fill in the blanks.                                                (5)

1. The bonding present in Magnesium chloride is ...................

2. Atomic number of phosphorus is ..........

3. The atomic number is sulphur is 16, and the electronic configuration is ...............

4. Nitrogen has ............ Lone pair of electrons.

5. The electronic configuration of oxygen is 2,4. The number of valence electron is ...............

Question 2.

An element X and Y has atomic numbers12 and 17.

a. State the name of the elements. 

b. Write the symbol of the elements.

c. What is their electronic configuration?

d. How many valence electrons are their?

e.  Explain the type of bonding between the two with the help of atomic structure.                 (10)

Question 3.

a. Name the following.

1. A non metal having atomic number 9.

2. Type of bonding in carbon tetra chloride.

3. Type of bonding in methane.

4. A metal with electronic configuration 2,8,3

5. Type of the element whose electronic configuration is 2,8.                                         (5)

b. Draw the atomic structure of 

1. Lithium

2. Silicon

3. Argon

4. Potassium

5. Beryllium.                                                        (5)

Question 3

a. Distinguish between modern and Daltons atomic theory. ( write 3 points each)              (3)

b. William Crooke and eminent scientist had performed and experiment.

1. What did he discovered?

2. How did he discovered it?                           (3)

c.  Define giving examples for each

1. Atom

2. Atomic number

3. Atomic mass number

4. Isotopes                                                          (4)

Question 4.

Ernest Rutherford had performed Scattering experiment.

a. Draw the scattering experiment.                 (2)

b. Write his observation and conclusion.       (3)