Atomic Theory Assessment (7)

All atoms of the same element must contain the same number of protons neutrons electrons quarks Isotopes of a given element contain Same number of neutrons but different number of protons Same number of neutrons and protons Same number of protons but a different number of neutrons Same number of protons but a different number of electrons An atom contains 31 protons, 39 neutrons and 31 electrons. Identify the mass number of this atom 31 70 39 62 Fill in the table below, you can use the periodic table You can draw or enter text, by clicking the "A" button. If you want to move the text box, highlight it with pointer and then click the 4 arrows button to drag it to where you want Iron has two isotopes, the most abundant isotope is Iron-56, what are the number of protons, neutrons and electrons in this atom, then draw what an atom would look like. Democritus coined the term "atomos" and had the idea that matter was made up of indivisible particles JJ Thomson discovered the electron, and created the "plum pudding" (chocolate chip cookie) model Dalton Father of modern atomic theory, proved the matter is made up of indivisible particles and combine in different combinations to form compounds Aristotle disagreed with Democritus, and said matter is made up of 4 elements, Earth, Air, Wind and Fire. Rutherford discovered the nucleus by shooting alpha particles through gold foil, noticing some bounced back