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What Am I?
Atomic Parts
Scientists
Table Pieces
It's Elementary
100
Has a positive charge.
What is a proton?
100
The two regions of the atom.
What are nucleus and electron cloud?
100

I did the Gold Foil experiment.

Who is Ernest Rutherford?

100
The number of periods in the Periodic Table.
What is seven?
100
My symbol is O and my atomic mass is 16.
What is oxygen?
200
I tell the number of protons contained inside an atom of an element.
What is the atomic number?
200
All of the mass of an atom is concentrated here.
What is the nucleus?
200

I found that the nucleus is surrounded by an electron cloud that is divided into shells, but electrons do not travel infixed orbits. 

Who is Schrodinger and Heisenberg?

200
Rows in the Periodic Table.
What are periods.
200
I have 16 electrons whizzing through my electron cloud.
What is sulfur?
300

Subatomic particle with a negative charge. 

What is an electron?

300
We live in the nucleus of an atom.
What are protons and neutrons?
300

I was the first to name the atom. 

 Who is Democritus?

300
There are 18 of these in the Periodic Table.
What are groups or families?
300
With an atomic mass of 39 and 20 neutrons in my nucleus, I am a very reactive metal.
What is potassium?
400
Atoms with the same number of protons, but different number of neutrons.
What are isotopes?
400
The two particles that are always found in the same number.
What are protons and electrons.
400

I thought that electrons are negative particles that travel in fixed orbits around the positively changed nucleus that is made of positive protons and neutral neutrons. 

Who is Neils Bohr?

400
Information that is contained within a square on the Periodic Table.
What are atomic number, element symbol, element name, and atomic mass?
400
I am the head of my family in the Halogens, and an important element in helping fight tooth decay.
What is flourine?
500
Why scientists use models to study atoms.
What is being so small?
500
The smallest subatomic particle, but its cloud accounts for the volume of an atom.
What is the electron?
500

Why did Democritus name the atom, atom?

After the greek word atomos, meaning "uncuttable" or "indivisible"

500
Credited with developing the first Periodic Table of the Elements, he arranged the elements in order of increasing atomic mass.
Who is Dmitri Mendeleev?
500
My properties are so unique I have my own separate space on the Periodic Table. I was also the end of the Hindenburg.
What is hydrogen?