History of the Atom
Who proposed the “solid sphere” model of the atom?
Who is John Dalton?
This number tells how many protons are in an atom.
What is atomic number?
What makes one element different from another?
What is the number of protons?
How many neutrons are in Potassium-39?
What is 20 neutrons?
Which particle changes when an atom becomes a cation?
What are electrons?
This scientist discovered the electron using cathode rays.
Who is J.J. Thomson?
Why is atomic mass rarely a whole number?
Because it is an average of isotopes, not a single atom.
How many subatomic particles located in the nucleus total are in Oxygen-16?
What is 16? (8p + 8n)
Two atoms have the same atomic number but different mass numbers. What are they?
What are isotopes?
Which is closer to the atomic mass of chlorine: 35 or 37? Why?
35, because Cl-35 is more abundant.
Who proposed the nuclear model after the gold foil experiment?
Who is Ernest Rutherford?
What is the atomic number for Cerium?
58
What is the mass number of an atom with 11 protons, 11 electrons, and 12 neutrons?
What is 23?
Which changes for Cl⁻: protons, neutrons, or electrons?
What are electrons?
8 protons, 10 neutrons, and 10 electrons. Write its notation.
O with 2- charge
Which scientist introduced energy levels in the atom?
Who is Niels Bohr?
Which is heavier: Carbon-12 or Carbon-14, and why?
What is Carbon-14 because it has more neutrons?
What is Tungsten's element symbol?
W
Magnesium has 12 protons and forms Mg²⁺. How many electrons does it have now?
What is 10 electrons?
11 protons, 10 electrons, and 12 neutrons. Write its symbol.
Na with + charge