Flashcards on Structure of Atom

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What is an atom?

An atom is the basic unit of matter that consists of a nucleus (containing protons and neutrons) surrounded by electrons.

Who proposed the atomic theory?

John Dalton proposed the atomic theory in the early 19th century.

What are the three subatomic particles present in an atom?

The three subatomic particles present in an atom are protons, neutrons, and electrons.

What is the charge of a proton?

A proton carries a positive charge.

What is the charge of an electron?

An electron carries a negative charge.

What is the charge of a neutron?

A neutron carries no charge and is neutral.

Where is the majority of the mass of an atom located?

The majority of the mass of an atom is located in the nucleus.

What is the atomic number of an atom?

The atomic number of an atom is the number of protons it contains.

What is the mass number of an atom?

The mass number of an atom is the total number of protons and neutrons it contains.

What are energy levels or electron shells?

Energy levels or electron shells are regions around the nucleus where electrons are likely to be found.

What is the maximum number of electrons in the first energy level?

The maximum number of electrons in the first energy level is 2.

How many electrons can the second energy level hold?

The second energy level can hold a maximum of 8 electrons.

What is an isotope?

An isotope is an atom of the same element with a different number of neutrons.

What is the valence shell of an atom?

The valence shell of an atom is the outermost energy level that contains electrons.

How is the periodic table organized?

The periodic table is organized based on the atomic number of elements arranged in increasing order.

What is an atom?

An atom is the basic unit of matter that consists of a nucleus (containing protons and neutrons) surrounded by electrons.

Who proposed the atomic theory?

John Dalton proposed the atomic theory in the early 19th century.

What are the three subatomic particles present in an atom?

The three subatomic particles present in an atom are protons, neutrons, and electrons.

What is the charge of a proton?

A proton carries a positive charge.

What is the charge of an electron?

An electron carries a negative charge.

What is the charge of a neutron?

A neutron carries no charge and is neutral.

Where is the majority of the mass of an atom located?

The majority of the mass of an atom is located in the nucleus.

What is the atomic number of an atom?

The atomic number of an atom is the number of protons it contains.

What is the mass number of an atom?

The mass number of an atom is the total number of protons and neutrons it contains.

What are energy levels or electron shells?

Energy levels or electron shells are regions around the nucleus where electrons are likely to be found.

What is the maximum number of electrons in the first energy level?

The maximum number of electrons in the first energy level is 2.

How many electrons can the second energy level hold?

The second energy level can hold a maximum of 8 electrons.

What is an isotope?

An isotope is an atom of the same element with a different number of neutrons.

What is the valence shell of an atom?

The valence shell of an atom is the outermost energy level that contains electrons.

How is the periodic table organized?

The periodic table is organized based on the atomic number of elements arranged in increasing order.

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