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5. The atomic number of an atom is equal to
B. Thermal energy decreases, slowing the motion of atoms and molecules.
B. number of valence electrons.
A. the number of electrons in the innermost energy level of an atom
C. outermost electron shell
A. the number of protons in the atom.
A. Electrons are arranged in a series of energy levels, or shells, that surround the nucleus.
A. an electron in the innermost energy level of an atom
A. An element is made of only one kind of atom. A compound is made of two or more elements that are chemically combined.
Reactivity of an atom is based on its __.
B. Thermal energy decreases, slowing the motion of atoms and molecules.
B. number of valence electrons.
A. the number of electrons in the innermost energy level of an atom
C. outermost electron shell
A. the number of protons in the atom.
A. Electrons are arranged in a series of energy levels, or shells, that surround the nucleus.
A. an electron in the innermost energy level of an atom
A. An element is made of only one kind of atom. A compound is made of two or more elements that are chemically combined.
How are electrons arranged in atoms?
B. Thermal energy decreases, slowing the motion of atoms and molecules.
B. number of valence electrons.
A. the number of electrons in the innermost energy level of an atom
C. outermost electron shell
A. the number of protons in the atom.
A. Electrons are arranged in a series of energy levels, or shells, that surround the nucleus.
A. an electron in the innermost energy level of an atom
A. An element is made of only one kind of atom. A compound is made of two or more elements that are chemically combined.
What is a valence electron?
B. Thermal energy decreases, slowing the motion of atoms and molecules.
B. number of valence electrons.
A. the number of electrons in the innermost energy level of an atom
C. outermost electron shell
A. the number of protons in the atom.
A. Electrons are arranged in a series of energy levels, or shells, that surround the nucleus.
A. an electron in the innermost energy level of an atom
A. An element is made of only one kind of atom. A compound is made of two or more elements that are chemically combined.
What is the difference between an element and a compound?
B. Thermal energy decreases, slowing the motion of atoms and molecules.
B. number of valence electrons.
A. the number of electrons in the innermost energy level of an atom
C. outermost electron shell
A. the number of protons in the atom.
A. Electrons are arranged in a series of energy levels, or shells, that surround the nucleus.
A. an electron in the innermost energy level of an atom
A. An element is made of only one kind of atom. A compound is made of two or more elements that are chemically combined.
A valence electron is located
B. Thermal energy decreases, slowing the motion of atoms and molecules.
B. number of valence electrons.
A. the number of electrons in the innermost energy level of an atom
C. outermost electron shell
A. the number of protons in the atom.
A. Electrons are arranged in a series of energy levels, or shells, that surround the nucleus.
A. an electron in the innermost energy level of an atom
A. An element is made of only one kind of atom. A compound is made of two or more elements that are chemically combined.
Which characteristic of an atom determines how it will react chemically with other elements and compounds?
B. Thermal energy decreases, slowing the motion of atoms and molecules.
B. number of valence electrons.
A. the number of electrons in the innermost energy level of an atom
C. outermost electron shell
A. the number of protons in the atom.
A. Electrons are arranged in a series of energy levels, or shells, that surround the nucleus.
A. an electron in the innermost energy level of an atom
A. An element is made of only one kind of atom. A compound is made of two or more elements that are chemically combined.
6. What happens when a substance changes from a gas to a liquid?
B. Thermal energy decreases, slowing the motion of atoms and molecules.
B. number of valence electrons.
A. the number of electrons in the innermost energy level of an atom
C. outermost electron shell
A. the number of protons in the atom.
A. Electrons are arranged in a series of energy levels, or shells, that surround the nucleus.
A. an electron in the innermost energy level of an atom
A. An element is made of only one kind of atom. A compound is made of two or more elements that are chemically combined.
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