This element is in a class all by itself and is the 1st element in the periodic table.
What is hydrogen?
200
The ability to reflect light or shiny.
What is luster?
200
Positively charged particles located in the nucleus of an atom.
What are protons?
200
He continued the work of the Greek Philosophers and came up with the atomic theory.
Who is John Dalton?
200
This group/family is the most reactive of the metals, containing 1 valence electron and the element lithium.
What is the alkali metals (Group 1)?
200
This is the most abundant metal in earth's crust.
What is aluminum?
300
The ability of a metal to be drawn into thin wires.
What is ductile?
300
Negatively charged particles located outside the nucleus of an atom.
What are electrons?
300
He came up with the electron cloud model.
Who is Niels Bohr?
300
This zone of the periodic table contains metals, non-metals, and metalloids.
What are the representative elements?
300
This is the most abundant element in the earth's crust.
What is oxygen?
400
The ability of a metal to be hammered into thin sheets or shaped into objects.
What is malleable?
400
The heaviest subatomic particles of an atom.
What are protons?
400
He discovered the nucleus.
Who is Ernest Rutherford?
400
This group/family on the periodic table is the least reactive group. It consists of all non-metals and has 8 valence electrons, except Helium, which has 2.
What are the noble gases?
400
To form a salt, these 2 groups/families must react and form bonds.
What is Group 1 (alkali metals) and Group 17 (Halogens)?
500
The number of electrons in the outer energy level of an atom.
What is valence electrons?
500
Atoms of an element that have the same number of protons but different numbers of neutrons.
What are isotopes?
500
He discovered electrons.
Who is JJ Thomson?
500
This is the common name for the group/family on the periodic table that contains the element that makes up 78% of our atmosphere.
What is the Nitrogen Family (Group 15)?
500
This term refers to the elements iron, cobalt, and nickel.