The number that tells how many protons are in the nucleus of the atom.
What is the atomic number
100
The 4 groups of elements that the periodic table is split into.
What are the metals, non-metals, metalloids, and noble gases.
100
Argon, helium, and neon are examples of this sub-group of the periodic table.
What are noble gases
200
True or False - An element is made up of different kinds of atoms.
What is false. elements are made up of the same kind of atoms.
200
Electron orbit around the nucleus in different ____ _____.
What are energy levels.
200
True or False - If I know the atomic number of an element I also know how many electrons are in the atom.
What is True - There are always the same number of electrons as protons in an element.
200
What the horizontal rows of the periodic table are called.
What are periods.
200
The particles that make up the nucleus of the atom.
What are the protons and neutrons.
300
A two letter combination that represents an element.
What is a symbol.
300
This model of an atom gives us the best view of an actual atom.
What is the electron cloud model.
300
The number that describes how many protons and neutrons are in the element.
What is the atomic mass number.
300
What the vertical columns of the periodic table of elements are called.
What are groups.
300
The man that arranged the elements into the first periodic table of elements.
Who is Dimitri Mendeleev.
400
When different atoms combine they form these.
What are molecules.
400
Is the smallest atomic particle and makes up the proton, neutron, and electron.
What is the quark.
400
An element that has the same number of protons but a different number of neutrons.
What is an isotope.
400
The reason that elements are put into vertical groups.
What are they have similar physical and chemical properties.
400
The region of the atom in which the electron travels.
What is the energy level.
500
Describe the relationship between atoms, elements, and molecules.
What is an element contains only one type of atom. All molecules are made up of a combination of different atoms.
500
The man that created the planetary model as an explanation of the atom.
Who is Neils Bohr.
500
If an element of Polonium has 84 protons and an atomic mass of 209, how many neutrons does it have in the nucleus?
What is 125. To figure out the number of neutrons you subtract the atomic number of 84 from the mass number of 209 and you find the number of neutrons = 125
500
Elements are arranged in horizontal rows called periods by increasing _______ ________