History
This Greek philosopher believed atoms were indivisible particles that he called atomos.
Who is Democritus?
The smallest subatomic particles in an atom.
What are electrons?
Number of protons in a neon atom.
What are 10?
The total number of protons and neutrons in an atom.
What is the mass number?
This model of the atom has electrons orbiting in energy levels at specific distances from the nucleus.
What is the Bohr model?
These subatomic particles are found in the nucleus.
What are protons and neutrons?
The atomic number of magnesium.
What is 12?
What is an anion?
The weighted average of masses of the naturally occurring isotopes of an element.
What is the atomic mass?
This scientist discovered electrons.
Who is JJ Thomson?
These subatomic particles have a positive charge.
What are protons?
Number of electrons in a neutral strontium atom.
What is 38?
The charge on a beryllium atom that has lost 2 electrons.
What is +2?
An atom with unequal numbers of protons and electrons.
What is an ion?
This is the most current model of the atom.
What is the quantum-mechanical model?
These subatomic particles are the largest.
Number of protons in a silver atom.
What is 47?
What is a cation?
The number of protons in the atoms of each element; used to identify that element.
What is the atomic number?
This scientist discovered the nucleus.
Who is Ernest Rutherford?
What are electrons?
Number of electrons in a neutral atom of iodine.
What is 53?
Number of neutrons in a sodium-23 atom.
What is 12?
Atoms of the same element with different numbers of neutrons.
What are isotopes?