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What is a valence electron?
A. the number of protons in the atom.
C. outermost electron shell
B. Thermal energy decreases, slowing the motion of atoms and molecules.
C. nucleus.
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. the number of electrons in the innermost energy level of an atom
A. positively charged particle in the nucleus of an atom
A. an electron in the innermost energy level of an atom
What is a neutron?
A. the number of protons in the atom.
C. outermost electron shell
B. Thermal energy decreases, slowing the motion of atoms and molecules.
C. nucleus.
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. the number of electrons in the innermost energy level of an atom
A. positively charged particle in the nucleus of an atom
A. an electron in the innermost energy level of an atom
5. The atomic number of an atom is equal to
A. the number of protons in the atom.
C. outermost electron shell
B. Thermal energy decreases, slowing the motion of atoms and molecules.
C. nucleus.
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. the number of electrons in the innermost energy level of an atom
A. positively charged particle in the nucleus of an atom
A. an electron in the innermost energy level of an atom
6. What happens when a substance changes from a gas to a liquid?
A. the number of protons in the atom.
C. outermost electron shell
B. Thermal energy decreases, slowing the motion of atoms and molecules.
C. nucleus.
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. the number of electrons in the innermost energy level of an atom
A. positively charged particle in the nucleus of an atom
A. an electron in the innermost energy level of an atom
The positively charged part of the atom is the ___.
A. the number of protons in the atom.
C. outermost electron shell
B. Thermal energy decreases, slowing the motion of atoms and molecules.
C. nucleus.
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. the number of electrons in the innermost energy level of an atom
A. positively charged particle in the nucleus of an atom
A. an electron in the innermost energy level of an atom
What is the difference between an element and a compound?
A. the number of protons in the atom.
C. outermost electron shell
B. Thermal energy decreases, slowing the motion of atoms and molecules.
C. nucleus.
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. the number of electrons in the innermost energy level of an atom
A. positively charged particle in the nucleus of an atom
A. an electron in the innermost energy level of an atom
A valence electron is located
A. the number of protons in the atom.
C. outermost electron shell
B. Thermal energy decreases, slowing the motion of atoms and molecules.
C. nucleus.
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. the number of electrons in the innermost energy level of an atom
A. positively charged particle in the nucleus of an atom
A. an electron in the innermost energy level of an atom
Which characteristic of an atom determines how it will react chemically with other elements and compounds?
A. the number of protons in the atom.
C. outermost electron shell
B. Thermal energy decreases, slowing the motion of atoms and molecules.
C. nucleus.
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. the number of electrons in the innermost energy level of an atom
A. positively charged particle in the nucleus of an atom
A. an electron in the innermost energy level of an atom
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