The discoveries of Niels Bohr were:

1. The relationship between outer shell and chemical properties: Niels Bohr's work on atomic structure led to the understanding that the arrangement of electrons in the outermost shell of an atom determines its chemical properties. This concept is known as the Bohr model of the atom.

2. Orbits of electrons: Bohr proposed that electrons orbit the nucleus of an atom in specific energy levels or shells. This idea revolutionized the understanding of atomic structure and laid the foundation for the development of quantum mechanics.

3. The charge on the electron: Bohr's work also contributed to the understanding of the charge on the electron. He showed that electrons carry a negative charge, which is equal in magnitude to the positive charge of the atomic nucleus.

Therefore, the correct answers are: the relationship between outer shell and chemical properties, orbits of electrons, and the charge on the electron.

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The discoveries of Niels Bohr were:

1. The relationship between outer shell and chemical properties: Niels Bohr's work on atomic structure led to the understanding that the arrangement of electrons in the outermost shell of an atom determines its chemical properties. This concept is known as the Bohr model of the atom.

2. Orbits of electrons: Bohr proposed that electrons orbit the nucleus of an atom in specific energy levels or shells. This idea revolutionized the understanding of atomic structure and laid the foundation for the development of quantum mechanics.

3. The charge on the electron: Bohr's work also contributed to the understanding of the charge on the electron. He showed that electrons carry a negative charge, which is equal in magnitude to the positive charge of the atomic nucleus.

Therefore, the correct answers are: the relationship between outer shell and chemical properties, orbits of electrons, and the charge on the electron.

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The discoveries of Niels Bohr were:

1. The relationship between outer shell and chemical properties: Niels Bohr's work on atomic structure led to the understanding that the arrangement of electrons in the outermost shell of an atom determines its chemical properties. This concept is known as the Bohr model of the atom.

2. Orbits of electrons: Bohr proposed that electrons orbit the nucleus of an atom in specific energy levels or shells. This idea revolutionized the understanding of atomic structure and laid the foundation for the development of quantum mechanics.

3. The charge on the electron: Bohr's work also contributed to the understanding of the charge on the electron. He showed that electrons carry a negative charge, which is equal in magnitude to the positive charge of the atomic nucleus.

Therefore, the correct answers are: the relationship between outer shell and chemical properties, orbits of electrons, and the charge on the electron.

Complete the sentence. Select all that apply. The discoveries of Niels Bohr were:the relationship between outer shell and chemical propertiesquantum energy emissionsstatic electricitythe charge on the electronorbits of electrons

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