1
Which scientist invented the earliest version of the periodic table?
Alexander-Emile Beguyer de Chancourtois
When an atom gains an electron it has this kind of electrical charge.
What is negative?
What is the most abundant element that accounts for up to 75 percent of the observed ordinary matter?
Hydrogen
Mercury, Cadmium, and zinc all belong to which group on the periodic table?
12
How many periods or rows are these on the periodic table?
7
Aluminium would have similar properties to which of the following chemical elements
Gallium
What is the symbol for potassium on the periodic table?
K
An atom with the same number of protons but different number of neutrons.
What is an isotope?
Mass number - atomic number = ______ __ ________.
Neutrons
What is the first chemical elements on the periodic table?
Hydrogen
The rows on the periodic table are arranged so that ____ are on the right side and _____ are on the left side.
Nonmetals/metals
What does the atomic number mean?
The number of protons in the atom
What is the most metallic element on the period table?
Francium
Which was the first element that was made artificially?
Tachnetium
Most of the chemical elements on the periodic table are
Metals
What is the difference between the modern and earleir periodic table?
The earlier table organised elements by atomic weight, while the modern table organised elements by atomic number
The element silver is name after which country ?
Argentina
What is the most conductive metal on the periodic table?
Silver
What do elements with features intermediate between those of nonmetals and metals are called?
Metalloids
What is the name of the columns of elements on the periodic table?
Groups