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Which of the following best describes the three general groups of elements?
30
the average mass of an atom
shiny luster
protons
isotopes
metal, metalloids, and nonmetals
periodic table
nonmetals
The atomic number of manganese is 25; its mass number is 55. How many neutrons does an atom of manganese have in its nucleus?
30
the average mass of an atom
shiny luster
protons
isotopes
metal, metalloids, and nonmetals
periodic table
nonmetals
What group contains elements that are gases at room temperature?
30
the average mass of an atom
shiny luster
protons
isotopes
metal, metalloids, and nonmetals
periodic table
nonmetals
The atomic mass of an element is __________ of that element.
30
the average mass of an atom
shiny luster
protons
isotopes
metal, metalloids, and nonmetals
periodic table
nonmetals
An element's atomic number is the number of __________ in the nucleus of each atom of that element.
30
the average mass of an atom
shiny luster
protons
isotopes
metal, metalloids, and nonmetals
periodic table
nonmetals
The __________ is a chart created by chemists to organize the elements.
30
the average mass of an atom
shiny luster
protons
isotopes
metal, metalloids, and nonmetals
periodic table
nonmetals
Atoms of the same element that have different numbers of neutrons are called?
30
the average mass of an atom
shiny luster
protons
isotopes
metal, metalloids, and nonmetals
periodic table
nonmetals
Which of the following is characteristic of most metals?
30
the average mass of an atom
shiny luster
protons
isotopes
metal, metalloids, and nonmetals
periodic table
nonmetals
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