Topic 0.1 Intro to Chemistry

How is an atom described in terms of its valence electrons?

• The total number of electrons in an atom

• The electrons located closest to the nucleus

• The electrons involved in chemical bonding and reactions

• The electrons with the highest energy

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Which of the following is NOT a characteristic of a chemical reaction?

• Change in color

• Formation of a solid

• Change in temperature

• No change in energy

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How many electrons can the first energy level of an atom hold?

• 2 electrons

• 8 electrons

• 18 electrons

• 32 electrons

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What are the fundamental components of an atom?

• Electrons, neutrons, and photons

• Protons, electrons, and photons

• Electrons, neutrons, and protons

• Photons, protons, and neutrinos

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How are the rows and columns of the periodic table organized?

• Rows are organized by increasing atomic numbers and columns by similar properties.

• Rows are organized by decreasing atomic mass, columns by increasing atomic number.

• Rows are organized by increasing atomic mass, columns by similar properties.

• Rows and columns are randomly organized.

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Which of the following particles are found in the nucleus of an atom?

• Electrons

• Neutrons

• Protons

• Valence Electrons

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In a model of an atom, where are electrons located?

• In a model of an atom, where are electrons located?

• In energy levels or electron shells surrounding the nucleus

• In the space between protons and neutrons

• Inside the protons

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What does electronegativity difference measure?

• The difference in size between protons and electrons

• The difference in mass between protons and neutrons

• The difference in energy levels of an atom

• The difference in attraction for electrons in a chemical bond

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Which type of bond involves the sharing of electrons between atoms?

• Covalent bond

• Ionic bond

• Metallic bond

• Hydrogen bond

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In an ionic bond, what happens to electrons between atoms?

• Electrons are shared equally.

• Electrons are transferred from one atom to another.

• Electrons are freely moving between atoms.

• Electrons are destroyed.

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