Structure of Atoms

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What is an atom?

An atom is the smallest unit of matter that retains the identity of a chemical element.

What are the three main subatomic particles?

The three main subatomic particles are protons, neutrons, and electrons.

Where are protons located in an atom?

Protons are located in the nucleus of an atom.

What is the charge of an electron?

An electron has a negative charge.

How does the number of protons in an atom's nucleus relate to its identity?

The number of protons determines the atomic number and identity of the element.

Where are electrons found in an atom?

Electrons are found in electron clouds or shells surrounding the nucleus.

What is the charge of a neutron?

A neutron has no charge; it is neutral.

What is the significance of the atomic number?

The atomic number identifies the element and determines its position on the periodic table.

What particle is responsible for the majority of an atom’s mass?

The majority of an atom’s mass is due to protons and neutrons, which are located in the nucleus.

What is the atomic mass of an atom?

Atomic mass is the weighted average mass of an atom’s isotopes, measured in atomic mass units (amu).

Can the number of neutrons in an atom vary?

Yes, variation in the number of neutrons forms different isotopes of the same element.

What is a model often used to describe the electron arrangement in an atom?

The Bohr model is commonly used for representing the electron arrangement with energy levels.

What is a valence electron?

A valence electron is an outer shell electron that is involved in chemical bonding.

Why are noble gases stable?

Noble gases are stable because they have a full valence shell of electrons.

What determines the chemical properties of an atom?

An atom’s chemical properties are primarily determined by its electron configuration, especially the valence electrons.