Structure of Matter

Which of the following best explains the relationship between molecules and atoms?

• Atoms are molecules that have a charge.

• Atoms have smaller parts, called molecules.

• Molecules are made up of two or more atoms.

• Molecules are atoms that have no mass.

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Atomic models of graphite and diamond are shown. Graphite is a soft, dark material often used as a lubricant. Diamond is often a clear, hard crystal. Which of the following best explains the difference in these materials?

• The arrangement of the atoms of each one

• The elements of which each one is made

• The number of atoms each one is made of

• The size and shape of the individual atoms

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What is the primary reason that molecules have different properties?

• The number of atoms in each molecule

• The types of atoms and their arrangement in the molecule

• The color of the atoms in the molecule

• The weight of the individual atoms

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Which of the following statements is true about the formation of molecules?

• Molecules can only be formed by atoms of the same element.

• Molecules are formed by the chemical bonding of two or more atoms.

• Molecules are formed by the physical mixing of atoms.

• Molecules can only be formed by atoms with the same mass.

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How many protons does this atom have?

• 2.5

• 10

• 5
• 20.18

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In the atom diagram shown, A is pointing to the darker particles, these are known as

• electrons

• protons

• neutrons

• the nucleus

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The extended structure of Sodium Chloride (NaCl) is shown. Which of the following describes the configuration of Layer 4 of the Sodium Chloride crystal?

• • It will be identical in all of its characteristics to Layer 1.

• It will contain 4 atoms of chlorine and 5 atoms of sodium.

• It will have chlorine atoms in all four of its corners.

• It will have sodium that are bonded only to other sodium atoms.

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Which correctly describes the smallest amount of an element?

• Atom

• Molecule

• Compound

• Proton

When atoms are joined together, they form .

• electrons

• nuclei

• protons

• molecules

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The atomic number of an atom is the number of 

• electrons in its nucleus

• protons in its nucleus
• neutrons in its nucleus
• electrons in the electron cloud

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