Atoms of the same element with a different number of neutrons.
What is an isotope?
This element has 20 protons.
What is Calcium (Ca)?
This scientist proposed that there is a positively charged nucleus and that electrons orbit the nucleus just like planets orbit the sun.
Who is Ernest Rutherford?
This particle has no charge and its only contribution to the atom is to give the atom more mass.
What is a neutron?
This elements atom has 6 electrons
What is Carbon (C)?
This particle has a negative charge and has a negligible mass.
What is an electron?
The mass of Oxygen with 8 protons and 10 neutrons
What is Oxygen-18?
This element has 30 electrons
What is Zinc (Zn)?
This scientist found the charge and the mass of an electron using the Oil Drop Experiment.
Who is Robert Millikan?
This particle identifies what type of element an atom is.
What are protons?
This is the formula to find the atomic mass of an atom.
What is # of protons + # neutrons?
This element has 84 protons and neutrons combined.
What is Krypton (Kr)?
This particle contributes mostly to the volume of the atom.
What is an electron?
The element with 23 protons and neutrons combined?
What is Sodium (Na)?