In the modern atomic model, these can be found in a cloud around the nucleus
What are electrons?
100
This is the symbol for sodium
What is Na?
100
The columns on the periodic table are called this
What are groups or families?
100
Mixtures can be classified as these 2 subcategories
What are homogeneous and heterogeneous?
200
This scientist developed the Plum Pudding Theory
Who is Thomson?
200
This element has 40 protons.
What is zirconium?
200
Periods on the periodic table go in this direction.
What is left to right?
200
A glass of sugar water is classified as this.
What is a homogeneous mixture?
300
This scientist disproved Thomson's theory by discovering the nucleus.
Who is Rutherford?
300
How are the atomic masses on the periodic table determined?
What is by calculating the average mass of the naturally occurring isotopes?
300
This number represents the number of protons and electrons.
What is the atomic number?
300
A bicycle that is rusting is an example of this type of change.
What is a chemical change?
400
These are the 4 parts of Dalton's atomic theory.
What is everything is made up of atoms, atoms of the same element look the same, atoms of different elements look different, and compounds are made up of 2 or more atoms.
400
Elements with the same number of protons and electrons but different numbers of neutrons are called this.
What are isotopes?
400
The elements on the periodic table are arranged according to this.
What are similar properties?
400
Density is an example of this type of physical property.
What is an intensive property?
500
This is the Rutherford's experiment that led to the discovery of the nucleus.
What is the gold foil experiment?
500
Calculate the average atomic mass for iodine:
80% Iodine-127
17% Iodine-126
3% Iodine-128
What is 126.86?
500
He is known as the father of the periodic table.
Who is Mendeleev?
500
Pure substances are further broken down into these 2 subcategories