Early Atomic Theories
This part of Dalton's theory was later disproven because atoms can be divided into subatomic particles.
What is "ATOMS ARE INDIVISIBLE"?
The correct order of these events by scientists is: cathode ray experiment, gold foil experiment, Bohr model, Uncertainty principle.
What is THOMSON, RUTHERFORD, BOHR, THEN HEISENBERG?
This particle changes when forming an isotope, and this one changes when forming an ion.
What are neutrons and electrons?
An aluminum ion with +3 charge has this many electrons
What is 10?
These are the two things that are the same for isotopes of the same element.
What are protons and electrons?
This term is defined as the weighted average of isotopes?
What is AVERAGE ATOMIC MASS?
Rutherford's model failed to explain why electrons didn't collapse into the nucleus, but this model introduced stable energy levels.
What is the BOHR MODEL?
The observation that some alpha particles bounced back from gold foil proved this part of the atom exists.
What is the NUCLEUS?
This subatomic particle contributes to atomic mass but not to atomic number.
What is a neutron?
Because it only loses one electron to be stable sodium forms this instead of Na2+
What is Na+?
These are the nuclear symbols for hydrogen’s three isotopes.
What are ¹H, ²H, and ³H?
H-1 is more abundant because hydrogen's atomic mass is closer to this than 2.
What is 1?
What is the UNCERTAINTY PRINCIPLE?
Bohr's planetary model work for hydrogen but not for larger atoms because it only explained one of these subatomic particles.
What is an ELECTRON?
An oxygen atom with mass 17 has this many neutrons and electrons.
What are 9 neutrons and 8 electrons?
An atom with 15 protons and 16 neutrons forms a -3 ion. It has this many electrons.
What is 18?
Neutron-to-proton ratio explains why this version of carbon is stable but carbon-14 is radioactive.
What is carbon-12?
An element with isotopes X-10 (20%) and X-11 (80%) has this average atomic mass.
What is 10.8 amu?
Who is J.J. THOMSON?
Who are HEISENBERG AND SCHRODINGER?
The arrangement of these subatomic particles in energy levels determines chemical reactivity
What are electrons?
Electron repulsion and electron loss is that makes these larger and smaller, respectively than their neutral atoms.
What are ANIONS and CATIONS?
This is the method scientists use to determine isotope ratios in a sample.
What is mass spectrometry?
This isotope is more abundant of boron's atomic mass is 10.81
What is B-11, Boron-11, or 11B?
This atomic model combines both wave and particle ideas of electrons.
What is the QUANTUM MECHANICAL MODEL?
What are PARTICLE ACCELERATORS and SPECTROSCOPY?
Neutrons are required for this kind of stability, and having too many or too few causes radioactivity.
What is nuclear stability?
Based on periodic trends, magnesium forms this type of ion and chlorine forms this type.
What is Mg2+ cation and Cl- anion?
The discovery of isotopes disproved this part of Dalton's theory.
What is THAT ALL ATOMS OF AN ELEMENT ARE IDENTICAL?
The average atomic mass of magnesium, given isotopes Mg-24 (79.0%), Mg-25 (10.0%), Mg-26 (11.0%), is this value.
What is 24.3 amu?