ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

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

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

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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.

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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.

Define the term ‘atomic number’ of an atom.

Define the term ‘mass number’ of an atom.

If an atom ‘A’ has mass number 35 and atomic number 17, state the number of protons, electrons and neutrons it contains.

State why the atomic weight of an element is also termed relative atomic mass.

If an atom ‘A’ has atomic number 19 and mass number 39, state –

1. Its electronic configuration.
2. The number of valence electrons it possesses.

Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.

Carbon – \[\ce{^12_6C}\]

[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]

Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.

Oxygen – \[\ce{^16_8O}\]

[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]

Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.

Phosphorus – \[\ce{^31_15P}\]

[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]

Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.

Argon – \[\ce{^40_18Ar}\]

[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]

Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.

Calcium – \[\ce{^40_20Ca}\]

[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]

‘Valency is the number of hydrogen atoms which can combine with [or displace] one atom of the element [or radical] forming a compound’. With reference to the above definition of valency, state the valency of chlorine in hydrogen chloride, giving reasons.

Match the statements in List I with the correct answer from List II.