Democritus, a greek philosopher, used the word atomos. This modern term word refers to the smallest particle of an element.
What is an atom?
100
This is known as the central core of the atom. It consists of protons and neutrons.
What is the nucleus?
100
What information in the periodic table indicates the number of protons in an atom?
What is atomic number?
100
Most of the elements found to the left of the zigzag line in the periodic table belong this major group.
What are metals?
100
These elements share characteristics of both metals and nonmetals.
What are semimetals/metalloids?
200
This scientist inferred that an atom's positive charge must be clustered in the nucleus, the core of an atom?
Who was Ernest Rutherford?
200
This particle is located in the central core and has a positive electrical charge.
What is proton?
200
On this you will find properties of the elements repeat in a regular pattern.
What is the periodic table?
200
Elements that easily transmit electricity and heat display the property known as.
What is conductivity?
200
These elements are found in the last group of the periodic table. They are not commonly reactive because they have a full set of electrons.
What are inert/noble gases?
300
This person used edvidence from experiments to develop a model that described atoms as smooth hard balls.
Who was John Dalton?
300
The electron is found orbiting the central nucleus of an atom on these.
What is the shell/energy level?
300
The horizontal row of the periodic table is known as.
What is a period?
300
This group of metals are the said to be the most reactive because of their readiness to react with other elements, especially the nonmetals.
What are Alkali Metals?
300
This element's atomic number is 14. Sand and clay both contain this element are used to make concrete and cement.
What is Silicon?
400
He described electrons as having only certain amounts of energy and moving in specific orbits around the nucleus, which is known as an energy level.
Who was Niels Bohr?
400
This particle has the smallest mass and a negative charge.
What is an electron?
400
These are 18 vertical columns on the periodic table where elements are grouped together because of the similiar chemical and physical properties.
What are groups/family?
400
If a material can be pulled out, or drawn into a long wire it has this property.
What is ductility/ductile?
400
This substance doesn’t conduct electricity as well as metal, but does conduct electricity better than a nonmetal.
What is a semiconductor?
500
His experiments led to the discovery of the electron, negatively charged particles in atoms.
Who was J.J. Thomson?
500
These particles makes up most of the atom's mass?
What are protons and neutrons?
500
This is the chemical symbol for Antimony.
What is Sb?
500
Groups 3 - 12 include most the familiar metals, such as iron, copper, nickel, silver, and gold. The metals in this family are often used for jewelry and construction.
What are transition metals?
500
This element is the most reactive gas of the halogens.