Gr 8 Natural Sciences Ch 2.1: Sub-atomic particles

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What is the central part of an atom that contains protons and neutrons?

Atomic nucleus (correct)

Electron shell

Electron cloud

Proton cluster

What determines the atomic number and identity of an element?

Mass of the nucleus

Number of electrons

Number of protons (correct)

Number of neutrons

What is the charge of neutrons?

Varies

Neutral (correct)

Positive

Negative

What is the role of neutrons in the atomic nucleus?

To stabilize the nucleus Signup and view all the answers

What is the location of electrons in an atom?

In the electron cloud Signup and view all the answers

What is the electrical charge of electrons?

Negative Signup and view all the answers

What is the significance of the number of neutrons in an atom?

Determines the atomic mass Signup and view all the answers

What is the term for particles smaller than an atom that make up its structure?

Sub-atomic particles Signup and view all the answers

What attracts electrons to the nucleus?

The positively charged protons Signup and view all the answers

What is a characteristic of electrons in terms of size?

They are much smaller than protons and neutrons Signup and view all the answers

What determines the chemical properties and reactivity of an element?

The arrangement of electrons in the outermost shell Signup and view all the answers

What is the modern model of the atom referred to as?

The electron cloud model Signup and view all the answers

What is a characteristic of pure substances?

They consist of only one type of matter throughout Signup and view all the answers

Why is understanding pure substances important in chemistry?

It provides a baseline for how elements and compounds behave when not mixed with other materials Signup and view all the answers

What keeps electrons in orbit around the nucleus?

The positively charged protons Signup and view all the answers

What is the significance of valence electrons?

They are involved in chemical bonding Signup and view all the answers

What is the electron cloud model used for?

To understand the behavior of atoms in chemical reactions Signup and view all the answers

What is an example of a pure substance?

Water (H2O) Signup and view all the answers

Why is understanding pure substances important in chemistry?

To provide a baseline for studying chemical reactions and properties Signup and view all the answers

What is characteristic of electrons in terms of their size compared to protons and neutrons?

They are smaller Signup and view all the answers

What is the primary function of protons in an atom?

To attract electrons to the nucleus Signup and view all the answers

Which of the following statements about neutrons is true?

Neutrons contribute to the atomic mass of an atom Signup and view all the answers

What is the main difference between protons and neutrons?

Their electrical charge Signup and view all the answers

Which sub-atomic particles are responsible for the overall charge of an atom?

Protons and electrons Signup and view all the answers

What is the relationship between the number of protons and the identity of an element?

The number of protons determines the atomic number of an element Signup and view all the answers

What is the term for the region around the atomic nucleus where electrons are likely to be found?

Electron cloud Signup and view all the answers

What is the significance of protons in the atomic nucleus?

They determine the atomic number and identity of an element Signup and view all the answers

What is the main difference between electrons and protons?

Their electrical charge Signup and view all the answers

What is the primary reason why electrons are arranged in a specific way in an atom?

To achieve a stable arrangement of electrons in the outermost shell Signup and view all the answers

What is the key characteristic of pure substances that makes them essential for studying chemical reactions?

Their uniform composition throughout Signup and view all the answers

What is the electron cloud model primarily used to understand?

The behavior of atoms in different chemical reactions Signup and view all the answers

What is the significance of valence electrons in chemical bonding?

They are particularly important for forming chemical bonds Signup and view all the answers

What is the primary difference between electrons and protons in terms of their size?

Electrons are smaller than protons Signup and view all the answers

What is the role of the nucleus in the electron cloud model?

It is a dense, positively charged region Signup and view all the answers

What is the primary reason for the existence of neutrons in the atomic nucleus?

To stabilize the nucleus by reducing electrostatic repulsion between protons Signup and view all the answers

What is the significance of the number of protons in an atom?

It determines the atomic number and identity of an element Signup and view all the answers

What is the relationship between protons and electrons in an atom?

Protons attract electrons, while electrons repel protons Signup and view all the answers

What is the term for the region around the atomic nucleus where electrons are likely to be found?

Electron cloud Signup and view all the answers

What is the characteristic of electrons in terms of their size compared to protons and neutrons?

Electrons are smaller than protons and neutrons Signup and view all the answers

What is the significance of the atomic number of an element?

It determines the identity of an element Signup and view all the answers

What is the role of protons in the atomic nucleus?

To determine the atomic number and identity of an element Signup and view all the answers

What is the primary function of electrons in an atom?

To orbit the nucleus and maintain the atom's structure Signup and view all the answers

What is the primary reason electrons are attracted to the nucleus?

Because of the positive charge of protons Signup and view all the answers

What is the significance of valence electrons in an element?

They are involved in chemical bonding Signup and view all the answers

What is an essential characteristic of pure substances?

They consist of only one type of matter throughout Signup and view all the answers

What is the electron cloud model used to understand?

The behavior and interaction of atoms in different chemical reactions Signup and view all the answers

What is a characteristic of electrons in terms of their size compared to protons and neutrons?

They are much smaller than protons and neutrons, approximately 1/2000th their size Signup and view all the answers

Gr 8 Natural Sciences Ch 2.1: Sub-atomic particles

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Questions and Answers

What is the central part of an atom that contains protons and neutrons?

What determines the atomic number and identity of an element?

What is the charge of neutrons?

What is the role of neutrons in the atomic nucleus?

What is the location of electrons in an atom?

What is the electrical charge of electrons?

What is the significance of the number of neutrons in an atom?

What is the term for particles smaller than an atom that make up its structure?

What attracts electrons to the nucleus?

What is a characteristic of electrons in terms of size?

What determines the chemical properties and reactivity of an element?

What is the modern model of the atom referred to as?

What is a characteristic of pure substances?

Why is understanding pure substances important in chemistry?

What keeps electrons in orbit around the nucleus?

What is the significance of valence electrons?

What is the electron cloud model used for?

What is an example of a pure substance?

Why is understanding pure substances important in chemistry?

What is characteristic of electrons in terms of their size compared to protons and neutrons?

What is the primary function of protons in an atom?

Which of the following statements about neutrons is true?

What is the main difference between protons and neutrons?

Which sub-atomic particles are responsible for the overall charge of an atom?

What is the relationship between the number of protons and the identity of an element?

What is the term for the region around the atomic nucleus where electrons are likely to be found?

What is the significance of protons in the atomic nucleus?

What is the main difference between electrons and protons?

What is the primary reason why electrons are arranged in a specific way in an atom?

What is the key characteristic of pure substances that makes them essential for studying chemical reactions?

What is the electron cloud model primarily used to understand?

What is the significance of valence electrons in chemical bonding?

What is the primary difference between electrons and protons in terms of their size?

What is the role of the nucleus in the electron cloud model?

What is the primary reason for the existence of neutrons in the atomic nucleus?

What is the significance of the number of protons in an atom?

What is the relationship between protons and electrons in an atom?

What is the term for the region around the atomic nucleus where electrons are likely to be found?

What is the characteristic of electrons in terms of their size compared to protons and neutrons?

What is the significance of the atomic number of an element?

What is the role of protons in the atomic nucleus?

What is the primary function of electrons in an atom?

What is the primary reason electrons are attracted to the nucleus?

What is the significance of valence electrons in an element?

What is an essential characteristic of pure substances?

What is the electron cloud model used to understand?

What is a characteristic of electrons in terms of their size compared to protons and neutrons?

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