Mendeleev created the first periodic table by arranging the elements in order of....
What is increasing atomic mass
100
Which group of elements have some properties of metals and some properties of nonmetals?
What is metalloids
100
In an atom the number of protons equals the number of
What is electrons
200
Hydrogen
What is H
200
This scientists performed the gold foil experiment. From the experiment, he proposed that an atom's positive charge is located in the center of the atom and an atom is mostly empty space.
What is Ernest Rutherford
200
Most of the elements on the periodic table are...
What is metals
200
Fluorine, Bromine, Chlorine, and Iodine are members of which family
What is halogen family
200
How is the modern periodic table organized?
What is by increasing atomic number
300
Silver
What is Ag
300
This scientist discovered that atoms contain negatively charged particles. His model consisted of negative charges scattered throughout a ball of positive charge.
What is J.J. Thomson
300
At room temperature, most of the nonmetals are found in this state of matter.
What is gas
300
These elements do not ordinarily form compounds and are not reactive.
What is noble gases
300
What are atoms with the same number of protons and different numbers of neutrons called?
What is isotopes
400
Gold
What is Au
400
This scientist is known as the father of the atomic theory and proposed that atoms of the same element are alike, compounds are made of atoms in a specific ratio, and all elements are made of atoms.
What is John Dalton
400
In the periodic table, where are the most reactive metals found?
What is Group 1
400
What family contains the most reactive metals and contains elements such as Lithium, Sodium, and Potassium?
What is Alkali metals
400
What are the horizontal rows of the periodic table called?
What is periods
500
Mercury
What is Hg
500
This scientists determined electrons orbit the nucleus in rings and electrons have a fixed energy level.
What is Niels Bohr
500
Which transition element is a liquid at room temperature?
What is Mercury
500
What is the most common alkaline earth metal?
What is calcium
500
A material that can be pulled out or drawn into a long wire displays what physical property?