STAAR Review 8.5: Question Preview (ID: 30408)


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The positively charged part of the atom is the ___.
a) A. electron cloud. b) B. orbits. c) C. nucleus. d) D. neutrons.
Reactivity of an atom is based on its __.
a) A. number of neutrons. b) B. number of valence electrons. c) C. number of electron shells. d) D. number of protons.
What is the difference between an element and a compound?
a) A. An element is made of only one kind of atom. A compound is made of two or more elements that are chemically combined. b) B. An element is made of two or more elements that are chemically combined. A compound is made of only one kind of atom. c) C. An element is always a single atom. A compound is always two atoms. d) D. An element is a single atom. A compound is a molecule made of identical atoms.
Which characteristic of an atom determines how it will react chemically with other elements and compounds?
a) A. the number of electrons in the innermost energy level of an atom b) B. the number of neutrons in the nucleus c) C. the atomic mass of the element d) D. the number of valence electrons
What is a valence electron?
a) A. an electron in the innermost energy level of an atom b) B. an electron that moves to a higher energy level c) C. an electron in the outermost energy level of an atom d) D. an electron that moves into the atom's nucleus
How are electrons arranged in atoms?
a) A. Electrons are arranged in a series of energy levels, or shells, that surround the nucleus. b) B. Electrons orbit around the nucleus, like the orbit of planets around the Sun. c) C. Electrons are located in the atomic nucleus. d) D. Electrons are arranged in a single energy level that surround
6. What happens when a substance changes from a gas to a liquid?
a) A. Thermal energy increases, increasing the motion of atoms and molecules. b) B. Thermal energy decreases, slowing the motion of atoms and molecules. c) C. Thermal energy decreases, increasing the motion of atoms and molecules. d) D. Thermal energy increases, slowing the motion of atoms and molecules.
What is a neutron?
a) A. positively charged particle in the nucleus of an atom b) B. negatively charged particle that orbits around the n c) C. neutral particle in the nucleus of an atom d) D. negatively charged particle in the nucleus of an atom
A valence electron is located
a) A. in the nucleus b) B. in the electron cloud c) C. outermost electron shell d) D. innermost electron shell
5. The atomic number of an atom is equal to
a) A. the number of protons in the atom. b) B. the number of protons and neutrons in the atom. c) C. the number of protons and electrons in the atom. d) D. the number of protons, neutrons, and electrons in the atom.
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