1. The distinct properties of atoms of different elements arise from their unique number of protons in the nucleus, which determines the element's identity, along with the arrangement of electrons.

    The distinct properties of atoms of different elements arise from their unique number of protons in the nucleus, which determines the element’s identity, along with the arrangement of electrons.

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  2. Atoms are the basic building blocks of matter, consisting of a nucleus containing protons and neutrons, surrounded by electrons. Molecules are formed when atoms chemically bond together, creating distinct chemical compounds.

    Atoms are the basic building blocks of matter, consisting of a nucleus containing protons and neutrons, surrounded by electrons. Molecules are formed when atoms chemically bond together, creating distinct chemical compounds.

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  3. The term "formula unit" is used for substances with ionic constituents because they do not consist of discrete molecules like covalent compounds. Instead, they form repeating units of ions, represented by a formula reflecting the ratio of ions in the compound.

    The term “formula unit” is used for substances with ionic constituents because they do not consist of discrete molecules like covalent compounds. Instead, they form repeating units of ions, represented by a formula reflecting the ratio of ions in the compound.

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