Atoms and Period Table

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What is an atom?

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An atom is the smallest unit of matter that retains the properties of an element. It consists of protons, neutrons, and electrons.

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What are protons?

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Protons are positively charged particles found in the nucleus of an atom. The number of protons determines the atomic number and the identity of the element.

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What are neutrons?

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Neutrons are neutral particles found in the nucleus of an atom. They contribute to the atomic mass but do not affect the charge of the atom.

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What are electrons?

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Electrons are negatively charged particles that orbit the nucleus of an atom. They are involved in chemical bonding and reactions.

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What is the atomic mass of an atom with 10 protons and 10 neutrons?

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The atomic mass is approximately 20, as it is the sum of protons and neutrons.

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What is the Periodic Table of Elements?

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The Periodic Table is a tabular arrangement of elements organized by increasing atomic number, which reflects the number of protons in the nucleus.

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What is a group in the Periodic Table?

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A group is a vertical column in the Periodic Table that contains elements with similar chemical properties.

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What is a period in the Periodic Table?

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A period is a horizontal row in the Periodic Table that indicates the number of electron shells in the atoms of the elements.

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What are alkali metals?

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Alkali metals are the elements in Group 1 of the Periodic Table. They are highly reactive and include lithium, sodium, and potassium.

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What are noble gases?

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Noble gases are the elements in Group 18 of the Periodic Table. They are characterized by their lack of reactivity due to having a full valence shell.