Earth Science: Geology, the Environment, and the Universe, New York

Section 1: What are elements?

What are elements?

1.
According to the symbols shown in the figure, in which state of matter do these elements occur?
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A)plasma
B)solid
C)liquid
D)gas
2.
Isotopes have the same number of __________ but different numbers of __________.
A)neutrons, protons
B)neutrons, electrons
C)protons, neutrons
D)electrons, protons
3.
What is a substance that cannot be broken down into simpler substances with all the characteristics of the substance?
A)a solid
B)matter
C)a gas
D)an element
4.
What do the nuclei of some isotopes release during radioactive decay?
A)valence electrons
B)lead
C)their nuclei
D)radiation
5.
What determines the chemical behavior of an element?
A)its isotopes
B)the valence electrons
C)the size of the nucleus
D)the number of energy levels
6.
What is the smallest particle of an element?
A)a neutron
B)an atom
C)an isotope
D)a proton
7.
What particle(s) make up the nucleus of an atom?
A)electrons only
B)neutrons and electrons
C)protons and neutrons
D)protons only
8.
What type of atomic particle has a negative charge?
A)a neutron
B)a proton
C)an electron
D)an isotope
9.
The number of protons in an atom's nucleus is the __________.
A)radioactivity number
B)isotopic number
C)atomic number
D)mass number
10.
Electrons tend to occupy the __________ energy level.
A)highest available
B)intermediate
C)second
D)lowest available
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