ICSE ICSE Class 8 - CISCE Question Bank Solutions

Dalton said that ______ could not be divided.

 Fill in the blank

An ion which has a positive charge is called a ..................

Fill in the blanks.

Isotopes are the atoms of ______ element having the ______ atomic number but ______ mass number.

Write true or false for the following statement

An atom on the whole has a positive charge.

 Give the following a suitable word/phrase.

Atoms of same element with same atomic number but a different mass number.

Multiple Choice Questions

 The sub atomic particle with negative charge is

Multiple Choice Questions

If the atomic number of an atom is 17 and mass number is 35 then number of neutron will be

 Multiple Choice Questions

 The sum of number of protons and number of neutrons present in the nucleus of an atom is called its

What are the two main features of Rutherford’s atomic model?

State the mass number, the atomic number, number of neutrons and electronic configuration of the following atoms.

`""^12""_6C, ""^16""_8O, ""^19""_9F, ""^20""_10Ne, ""_13""Al""^27, ""_17""Cl""^35` 

Also, draw atomic diagrams for them.

What is variable valency? Name two elements having variable valency and state their valencies.

The atomic number and the mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement.

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

FILL IN THE BLANK

Atomic theory of matter was given by ..........................

FILL IN THE BLANK

Rutherford won the Nobel Prize in 1908 for his investigations in the field of ......................

Tick the most appropriate answer.

Which of these have similar chemical properties but different set of physical properties and mass number?

1. isobars
2. elements
3. isotopes
4. none of these

TRUE \ FALSE

After the emission of a beta-particle, the atomic number of the atom increases by one.

WRITE SHORT ANSWER

Define the atomic mass number of an atom.

What are orbits or shells of an atom?

State the main postulates of Dalton’s atomic theory.