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
The horizontal rows in the periodic table are known as
Periods
The smallest piece of matter that still has the properties of the element are
Atom
The abbreviation for an element in the periodic table is called
Atomic Symbol
the current model which shows electrons traveling around a nucleus at different energy levels
Electron Cloud Model
An atom of the same element that has a different number of neutrons than usual.
Isotope
The columns in a periodic table are called______
groups
The Lanthanide and Actinide metals are placed below the table because
It fits better on the printed page
These elements are usually gasses or brittle, dull (un-shiny) solids at room temperature.
Nonmetals
What is the Mass Number for Sodium, based on the table above? Only answer using the number keys on your keyboard.
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