Atoms and Periodic Table Test Flashcards
Mendeleev created the first periodic table by arranging the elements in order of
increasing (smallest to biggest) atomic mass
How did chemists change Mendeleev’s periodic table in the early 1900s?
They used atomic number instead of atomic mass to organize the elements.
Most metals are NOT ____.
liquid at room temperature
In the periodic table, the most reactive metals are found ____.
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in Group 1, the first column on the left
Which group contains the most elements?
Metals
A material is said to be ductile if it ____
can be spun out, or drawn, into a long wire
In an electrically neutral atom, the number of protons equals the number of ____.
Electrons
The elements in a column of the periodic table
have similar properties
What information in the periodic table indicates the number of protons in an atom?
the element’s atomic number
Which of the following statements about transition metals is true?
They include familiar metals such as gold, silver, copper, and nickel.
Which group of elements shares characteristics with both metals and nonmetals?
Metalloids
The elements that never form compounds are ____.
Noble Gasses
Which particles in atoms have a negative electric charge?
Electrons
This number is based on the total number of protons and neutrons in an atom.
Mass Number
Fluorine, chlorine, bromine, and iodine are part of a family called ____
Halogens
