THE ATOM

An atom of oxygen with 8 protons, 8 electrons, and 6 neutrons would have a mass number of

An atom of silver with 47 protons, 47 electrons, and 61 neutrons would have a mass number of

Who discovered the presence of neutrons in the atom?

If an isotope of uranium, uranium-235, has 92 protons, how many protons does uranium-238 have?

Who developed the plum pudding model of the atom?

What do you call the region of the atom that contains the most mass?

Who used an experiment and determined there was a dense mass at the center of the atom?

If hydrogen-1 has 1 proton, how many protons does hydrogen-2 have?

How did Democritus describe atoms?

Which force, found in the nucleus, explains why particles that are close together stay close?

What is the difference between an atom and an isotope?

If helium-3 has 2 protons, how many protons does helium-5 have?

What is the difference between an atom and an ion?

Who determined that there were neutral particles in the nucleus as well as positive ones?

Why is that model no longer accepted by scientists today?

Which subatomic particle is responsible for the properties of an element?

Who developed the idea that atoms were indivisible particles?

What is the weighted average of all the naturally occuring isotopes of an element called?

What did scientists Schrodinger and Heisneberg discover in the atom?

An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of

Which force is between the protons and the electrons?

What does the number of protons determine?

An atom of carbon with 6 protons, 6 electrons, and 6 neutrons would have a mass number of?

What do you call the total protons and neutrons in an atom?

What is the name of a positive ion?

What is the dense center of the atom called?

Which force, found in the nucleus, explains the radioactive properties within the atom?

In what order are the discoveries of the atomic theory?

The smalles particle by which an element can be divided and still be the same substance?

Who did Democritus prove wrong with his theory about the atom?

What changes between an isotope and an atom?

In Thomson's "plum-pudding model" of the atom, the plums represent?

If an isotope of plutonium, plutonium-249, has 94 protons, how many protons in plutonium-244?

What is the negatively charged particle that is found in a cloud outside the nucleus?

What never changes in an atom, so it determines the properties of the atom?

What is a unit of mass that describes the mass of an atom or molecule?

How is the atomic mass different from the mass number?

What does the word atomos mean?

What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in common?

What is the atomic symbol for copper?

What are the number of protons, neutrons, and electrons for Lithium-13 (in that order)

What part of the atom is posititively charged?

Which of the following was NOT part of John Dalton's Atomic Theory?

Which force in the atom is a pull between items with mass?

What is the name of a negative ion?

What does the model below represent?

Who created the first model showing that electrons move in definite pathways?

How is an ion different from an atom?