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Name:
Date:
A t o m i c
s t r u c t u r e
Exercise 1: Label the structures indicated with their
respective names.
Exercise 2: Match the names to the structures described in
the following sentences.
Part of the atom that has no charge
Part of the atom that has a positive charge
Part of the atom that has a negative charge
The mass number is determined by this
The atomic number is determined by this
It must have the same number of these particles
Page 2


Name:
Date:
A t o m i c
s t r u c t u r e
Exercise 1: Label the structures indicated with their
respective names.
Exercise 2: Match the names to the structures described in
the following sentences.
Part of the atom that has no charge
Part of the atom that has a positive charge
Part of the atom that has a negative charge
The mass number is determined by this
The atomic number is determined by this
It must have the same number of these particles
Exercise 1: Label the structures indicated with their
respective names.
Exercise 2: Match the names to the structures described in
the following sentences.
Atomic structure
Answer sheet
Electronic cloud
Electron
Atomic orbitals
Atomic nucleus
Neutron
Proton
Neutron
Proton
Electron
Protons and
neutrons
Protons
Protons y
electrons
Part of the atom that has no charge
Part of the atom that has a positive charge
Part of the atom that has a negative charge
The mass number is determined by this
The atomic number is determined by this
It must have the same number of these particles
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FAQs on Visual Worksheet: Atomic Structure (with Solutions) - Science Class 9

1. What is the basic structure of an atom?
Ans. An atom consists of three main subatomic particles: protons, neutrons, and electrons. Protons and neutrons are located in the nucleus at the center of the atom, while electrons orbit around the nucleus in various energy levels.
2. How do you determine the atomic number of an element?
Ans. The atomic number of an element is determined by the number of protons present in the nucleus of its atoms. This number uniquely identifies the element and determines its position on the periodic table.
3. What is the difference between atomic mass and atomic weight?
Ans. Atomic mass refers to the mass of a single atom, typically measured in atomic mass units (amu), while atomic weight is the average mass of an element’s isotopes, weighted by their natural abundance. Atomic weight is often found on the periodic table.
4. What role do electrons play in chemical bonding?
Ans. Electrons, particularly those in the outermost shell (valence electrons), are crucial for chemical bonding. They can be shared or transferred between atoms, leading to the formation of covalent or ionic bonds, which are essential for the creation of molecules.
5. How does the arrangement of electrons affect an atom's reactivity?
Ans. The arrangement of electrons determines an atom's reactivity. Atoms with a full outer shell of electrons are generally stable and less reactive, while those with incomplete outer shells tend to be more reactive as they seek to gain, lose, or share electrons to achieve stability.
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