Atomic Structure
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Particle Theory of Matter
SubtopicParticle Theory of Matter under Atomic Structure for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Which state of matter can flow but has a fixed volume?
A.Solid
B.Liquid
C.Gas
D.Rock
- 2.
The symbol for the element Aluminum is:
A.Am
B.Al
C.Au
D.An
- 3.
Particles of matter ________ each other.
A.Repel
B.Attract
C.Ignore
D.Destroy
- 4.
Which of the following is a mixture?
A.Air
B.Distilled Water
C.Iron
D.Carbon Dioxide
- 5.
Which of the following represents a mixture?
A.Carbon dioxide
B.Sugar solution
C.Sodium chloride
D.Water
- 6.
The combining capacity of an element is known as its:
A.Atomic number
B.Mass number
C.Valency
D.Molecule
- 7.
Which of the following is a characteristic of a solid?
A.Particles can flow easily.
B.High compressibility.
C.Definite shape and volume.
D.Very large intermolecular spaces.
- 8.
If an atom loses an electron, it becomes a charged particle. What is this charged particle called?
A.Molecule
B.Isotope
C.Ion
D.Element
- 9.
Which of the following substances consists of only one type of 'molecule' but each molecule consists of two different types of 'atoms'?
A.Oxygen gas ()
B.Carbon dioxide ()
C.Iron filings ()
D.Milk
- 10.
When steam condenses into water, the particles:
A.Gain energy and move faster.
B.Lose energy and move slower.
C.Stay the same but change their chemical identity.
D.Vibrate more vigorously.
Download the worksheet for Atomic Structure - Particle Theory of Matter to practice offline. It includes additional chapter-level practice questions.
Atomic Structure
SubtopicAtomic Structure under Atomic Structure for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Which of these is the symbol for Neon?
A.B.C.D. - 2.
The symbol for the element Silicon is:
A.B.C.D. - 3.
In the following diagram of an atom, what is the charge of the particle labeled 'E' that orbits the center?
A.Positive
B.Negative
C.Neutral
D.No charge
- 4.
What is the symbol for Fluorine?
A.B.C.D. - 5.
In the structure of an atom, where is the most of the empty space located?
A.Inside the nucleus
B.Between the nucleus and electrons
C.Inside the proton
D.Inside the neutron
- 6.
Which element has the symbol ''?
A.Potassium
B.Phosphorus
C.Platinum
D.Lead
- 7.
Identify the polyatomic ion in the compound .
A.B.C.D. - 8.
In the following reaction, identify the total number of Oxygen atoms in the reactants side:
A.1
B.2
C.3
D.4
- 9.
A substance 'Y' cannot be broken down into simpler substances by chemical means. 'Y' is likely to be:
A.A compound
B.A mixture
C.An element
D.A molecule of a compound
- 10.
Identify the diatomic element from the following list.
A.Neon
B.Oxygen
C.Sulfur
D.Phosphorus
Download the worksheet for Atomic Structure - Atomic Structure to practice offline. It includes additional chapter-level practice questions.
Postulates of Bohr's Theory of Atom
SubtopicPostulates of Bohr's Theory of Atom under Atomic Structure for Grade 7 CBSE.
Preview questions (no answers)
- 1.
What happens when an electron falls from an outer shell to an inner shell?
A.It absorbs energy
B.It loses mass
C.It releases energy
D.Nothing happens
- 2.
The shell closest to the nucleus is numbered as:
A.0
B.1
C.2
D.3
- 3.
Which of the following is true for Bohr's model?
A.Electrons are in the nucleus
B.Orbits have fixed energy
C.Atoms have no nucleus
D.Electrons stay still
- 4.
The term 'stationary orbits' means the electron's ________ is constant.
A.Mass
B.Energy
C.Speed
D.Size
- 5.
Which of these is a correct summary of a Bohr postulate?
A.Electrons are embedded in a positive sphere
B.Electrons revolve in orbits and radiate energy
C.Electrons revolve in discrete orbits without losing energy
D.Protons revolve around the electrons
- 6.
When electrons are in their lowest possible energy levels, the atom is said to be in the:
A.Excited state
B.Ground state
C.Liquid state
D.Gaseous state
- 7.
Which number corresponds to the shell?
A.2
B.3
C.4
D.5
- 8.
What is the electronic configuration of Magnesium (Atomic Number 12)?
A.2, 8, 2
B.2, 10
C.8, 2, 2
D.2, 2, 8
- 9.
According to Bohr-Bury scheme, electrons are not accommodated in a given shell unless:
A.The outer shells are filled
B.The inner shells are filled
C.The nucleus is large
D.The atom is in a gaseous state
- 10.
Which orbit has the lowest energy level?
A.B.C.D.
Download the worksheet for Atomic Structure - Postulates of Bohr's Theory of Atom to practice offline. It includes additional chapter-level practice questions.
Electronic Configuration of Elements 1 to 20
SubtopicElectronic Configuration of Elements 1 to 20 under Atomic Structure for Grade 7 CBSE.
Preview questions (no answers)
- 1.
Identify the atom represented in the following diagram based on the distribution of its 3 electrons.
A.Helium
B.Lithium
C.Beryllium
D.Boron
- 2.
An element has an atomic number of 11. Which element is this?
A.Magnesium
B.Neon
C.Sodium
D.Aluminum
- 3.
The atomic number of Carbon is 6. What is its correct electronic configuration?
A.(2, 4)
B.(4, 2)
C.(2, 2, 2)
D.(6, 0)
- 4.
What is the maximum number of electrons that can be accommodated in the innermost shell ( shell) of an atom?
A.8
B.18
C.2
D.32
- 5.
For Calcium (), the electrons are distributed across which shells?
A.K and L only
B.K, L, and M only
C.K, L, M, and N
D.L, M, and N only
- 6.
Which of the following elements has a completely filled outermost shell, making it chemically stable?
A.Oxygen (Z=8)
B.Neon (Z=10)
C.Fluorine (Z=9)
D.Nitrogen (Z=7)
- 7.
Chlorine has an atomic number of 17. How many electrons are present in its outermost () shell?
A.8
B.7
C.17
D.1
- 8.
An Oxide ion () is formed when an Oxygen atom () gains 2 electrons. What is the electronic configuration of the ion?
A.(2, 6)
B.(2, 4)
C.(2, 8, 2)
D.(2, 8)
- 9.
The electronic configuration of Potassium () is unique because the 19th electron enters the shell instead of completely filling the shell first. What is its configuration?
A.(2, 8, 9)
B.(2, 9, 8)
C.(2, 8, 8, 1)
D.(2, 8, 7, 2)
- 10.
- Electronic Configuration of Elements 1 to 20: practice question 1 for Atomic Structure?
A.Option A
B.Option B
C.Option C
D.Option D
Download the worksheet for Atomic Structure - Electronic Configuration of Elements 1 to 20 to practice offline. It includes additional chapter-level practice questions.
Periodic Table till the first 20 elements
SubtopicPeriodic Table till the first 20 elements under Atomic Structure for Grade 7 CBSE.
Preview questions (no answers)
- 1.
What is the atomic number of Sodium ()?
A.9
B.10
C.11
D.12
- 2.
The symbol comes from the Latin name 'Kalium'. Which element is it?
A.Krypton
B.Potassium
C.Calcium
D.Phosphorus
- 3.
What is the atomic number of Sulphur?
A.14
B.15
C.16
D.17
- 4.
Which of these elements has the highest atomic number among the choices?
A.Sodium
B.Aluminium
C.Sulphur
D.Calcium
- 5.
Consider the following components of an atom. Which path correctly shows the arrangement from the center outward?
A.Neutron -> Electron -> Proton
B.Proton -> Neutron -> Electron
C.Nucleus -> Electron Shells
D.Electron -> Nucleus -> Shells
- 6.
Identify the element with symbol .
A.Silver
B.Aluminium
C.Argon
D.Gold
- 7.
The valency of Helium is because:
A.It has no electrons
B.It has a completely filled shell
C.It has only 1 proton
D.It is very heavy
- 8.
Look at the diagram of the atom. If shell 1 is K and shell 2 is L, which element is shown?
A.Lithium
B.Beryllium
C.Boron
D.Carbon
- 9.
The mass of a neutral atom is primarily due to:
A.Electrons and Protons
B.Protons and Neutrons
C.Electrons and Neutrons
D.Only Protons
- 10.
An atom with atomic number 14 is a:
A.Metal
B.Non-metal
C.Metalloid
D.Noble gas
Download the worksheet for Atomic Structure - Periodic Table till the first 20 elements to practice offline. It includes additional chapter-level practice questions.