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STAAR Review 8.5
Test Description: STAAR TEKS 8.5 Parts of an atom
Instructions: Answer all questions to get your test result.
1) What is a neutron?
A
B. negatively charged particle that orbits around the n
B
C. neutral particle in the nucleus of an atom
C
D. negatively charged particle in the nucleus of an atom
D
A. positively charged particle in the nucleus of an atom
2) 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
D. Thermal energy increases, slowing the motion of atoms and molecules.
C
B. Thermal energy decreases, slowing the motion of atoms and molecules.
D
C. Thermal energy decreases, increasing the motion of atoms and molecules.
3) 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
D. Electrons are arranged in a single energy level that surround
D
C. Electrons are located in the atomic nucleus.
4) What is a valence electron?
A
C. an electron in the outermost energy level of an atom
B
D. an electron that moves into the atom's nucleus
C
A. an electron in the innermost energy level of an atom
D
B. an electron that moves to a higher energy level
5) Which characteristic of an atom determines how it will react chemically with other elements and compounds?
A
B. the number of neutrons in the nucleus
B
C. the atomic mass of the element
C
A. the number of electrons in the innermost energy level of an atom
D
D. the number of valence electrons
6) What is the difference between an element and a compound?
A
B. An element is made of two or more elements that are chemically combined. A compound is made of only one kind of atom.
B
A. An element is made of only one kind of atom. A compound is made of two or more elements that are chemically combined.
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.
7) The positively charged part of the atom is the ___.
A
B. orbits.
B
A. electron cloud.
C
C. nucleus.
D
D. neutrons.
8) Reactivity of an atom is based on its __.
A
A. number of neutrons.
B
D. number of protons.
C
B. number of valence electrons.
D
C. number of electron shells.
9) A valence electron is located
A
C. outermost electron shell
B
A. in the nucleus
C
D. innermost electron shell
D
B. in the electron cloud
10) 5. The atomic number of an atom is equal to
A
B. the number of protons and neutrons in the atom.
B
C. the number of protons and electrons in the atom.
C
D. the number of protons, neutrons, and electrons in the atom.
D
A. the number of protons in the atom.
*select an answer for all questions
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