This scientist is credited with discovering that atoms are made of mostly empty space, and that the electrons orbit the nucleus
Who is Ernest Rutherford?
100
Elements on the periodic table are organized by this.
What is atomic number or number of protons?
100
An oxygen molecule has this many atoms of oxygen.
What is 2?
100
This subatomic particle has a positive charge and is found in the nucleus of an atom.
What is a proton?
100
This is a type of matter composed of a single type of particle and always has distinct, predictable properties.
What is a pure substance?
200
Joseph Priestly used these three things to determine that plants can change the composition of air and that fire and living things need something in air to survive.
What are a candle, a plant, and a mouse?
200
Carbon has this many protons.
What is 6?
200
A nitrogen molecule has this many atoms of nitrogen.
What is 2?
200
This subatomic particle has a neutral charge and is found in the nucleus of an atom.
What is a neutron?
200
A salad is this type of mixture.
What is a heterogeneous mixture?
300
This scientist determined that electrons orbit the nucleus.
Who is Niels Bohr?
300
This element has 12 electrons.
What is magnesium?
300
An oxygen molecule has this type of bond.
What is a double bond?
300
This subatomic particle has a negative charge and is found orbiting the nucleus of an atom.
What is an electron?
300
Milk is this type of mixture.
What is a homogeneous mixture?
400
This scientist has four parts to his atomic theory.
Who is John Dalton?
400
Chlorine has this many neutrons.
What is 18?
400
A nitrogen molecule has this type of bond.
What is a triple bond?
400
This particle of an atom occupies the most space.
What is an electron? (electron cloud)
400
When two elements come together to form this, new properties emerge.
What is a compound?
500
This is the name of Ernest Rutherford's experiment.
What is the gold foil experiment?
500
This element is in group 1 period 2.
What is lithium?
500
This is the percent of nitrogen, oxygen, and "other" in air.
What is nitrogen - 78%
oxygen - 21%
other - 1%
500
These two particles of an atoms makes up the mass of an atom.
What are proton and neutron?
500
These are two ways nitrogen can return to the soil.
What is through animal waste and the decay of living organisms?