Chapter 3: Elements and Atoms

Elements are:

• Compounds made of two or more substances

• Pure substances consisting of only one type of atom

• Mixtures of different atoms and molecules

• Substances that can be broken down into simpler substances

Atoms are:

• the smallest units of matter

• large molecules

• types of energy

• chemical reactions

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The parts of an atom are:

• Proton, Neutron, Electron

• Molecule, Cell, Nucleus

• Solid, Liquid, Gas

• Atom, Ion, Isotope

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The atomic number is:

• The number of protons in an atom

• The number of neutrons in an atom

• The number of electrons in an atom

• The sum of protons and neutrons in an atom

Atomic mass is:

• The number of protons in an atom

• The total number of protons and neutrons in an atom

• The number of electrons in an atom

• The number of neutrons in an atom

Electrons in an atom are arranged in:

• random positions

• fixed orbits or shells

• the nucleus

• outside the atom

The periodic table is:

• a chart of elements arranged by atomic number

• a list of chemical reactions

• a table of mathematical formulas

• a calendar of scientific events

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Isotopes are:

• atoms of the same element with different numbers of neutrons

• atoms of different elements with the same number of protons

• molecules with different atomic numbers

• elements with the same mass number

All elements are solids at room temperature.

• True

• False

An element can be chemically broken down into simpler substances.

• True

• False