Dead Chemists Society
A Matter of Particles
Chemical Dump
Periodic Tidbits
All About Electrons
100
This chemist performed experiments using a cathode-ray tube leading to the discovery of the electron.
Who is J.J. Thomson?
100
The atomic number of an element is equal to the number of these in its nucleus.
What are protons?
100
This term refers to the measure of how close a series of measurements are to one another, irrespective of the accepted value.
What is precision?
100
In the modern periodic table, the elements are arranged by this number.
What is the atomic number?
100
The 2s sublevel has this many electrons
What is 2?
200
Although this chemist proposed an atomic theory claiming that elements are made up of indivisible particles called atoms, that atoms of the same element are identical, and that atoms of different elements can chemically combine in simple whole-number ratios to form compounds, he had no knowledge of the protons and neutrons of the atomic nucleus.
Who is John Dalton?
200
This is the molar mass of carbon dioxide.
What is 44g?
200
This states that in any physical change or chemical reaction, mass is conserved.
What is the law of conservation of mass?
200
Most elements are this type of matter.
What are metals?
200
Calcium has this many valence electrons.
What is 2?
300
This chemist performed experiments involving bombarding gold foil with alpha particles, thus providing evidence for the nature of the atomic nucleus.
Who is Ernest Rutherford?
300
An atom of Sulfur-35 has this many neutrons.
What is 19?
300
6.02 X 10^23 has this many significant figures.
What is 3?
300
This is another name for the group 17 elements.
What are the halogens?
300
This is the Stock name for the cation present in PbCl2?
What is Lead (II)?
400
This chemist organized the elements by atomic mass, leading to the development of the modern periodic table.
Who is Dmitri Mendeleev?
400
63.546 grams of copper has this many atoms.
What is 6.02 X 10^23 (or Avagadro's number)?
400
This is the distance between crests in a wave.
What is the wavelength?
400
This atomic property generally increases from right to left across the periodic table.
What is atomic radius?
400
This is the electron dot structure for a silicon atom.
What is Si (with one dot on each side)?
500
This chemist (first name Wolfgang) developed a principle that states that each atomic orbital may describe at most two electrons.
Who is Pauli?
500
This is the type of ion that a bromine atom is likely to form.
What is an anion?
500
This is the chemical formula for calcium hydroxide.
What is Ca(OH)2?
500
This is the atomic mass calculated if the element Chilhowium (Ch) has isotopes Ch-121 (92% abundance) and Ch 123 (8% abundance).
What is 121.16?
500
An electron emits one of these when it moves from a higher energy level to a lower energy level.
What is a photon?
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