A chemical bond formed by the sharing of a single pair,two pairs,or three pairs of electrons between the two atoms.
What is a Covalent Bond?
100
The American Physicist who devised a method for determining the mass of an electron?
Who is Robert A. Millikan?
100
The basic unit of a chemical element.
What is a atom?
100
A chemical element with symbol Ar and atomic number 18. It is in group 18 of the periodic table.
What is argon?
100
A process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form.
What is a Chemical Reaction?
200
Formed when one atom (usually a metal) loses a valence electron to a second atom.
What is Ionic Bonding
200
Believed that water was formed from the simplest combination of hydrogen and oxygen atoms.
Who is John Dalton?
200
A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron.
What is a proton?
200
A chemical element with symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table.
What is helium?
200
States that matter can either be destroyed or created in a chemical reaction.
What is conservation of mass?
300
Valence electrons are the outermost electrons of an atom. These are the electrons involved in chemical reactions.
What are Bonding Electrons?
300
He developed the atomic theory originated by his teacher Leucippus.
Who is Democritus?
300
A subatomic hadron particle which has the symbol n or n0, no net electric charge and a mass slightly larger than that of a proton.
What is a neutron?
300
A chemical element with symbol H and atomic number 1. With an atomic weight of 1.00794 u, hydrogen is the lightest element and its monatomic form is the most abundant chemical substance.
What is hydrogen?
300
The number equal to the number of carbon atoms in exactly 12 of pure C-12.
What is a mole?
400
An attraction between atoms that allows the formation of chemical substances that contain two or more atoms.
What is a chemical bond?
400
New Zealand scientist who discovered the nucleus.
Who is Rutherford?
400
Either a proton or neutron in the nucleus of atom.
What is a nucleon?
400
A chemical element in the boron group with symbol Al and atomic number 13. It is silvery white, and it is not soluble in water under normal circumstances.
What is aluminum?
400
The formation of an insoluble substance from a chemical or physical change, or, the insoluble substance itself.
What is Precipitate?
500
A weak bond between two molecules resulting from an electrostatic attraction between a proton in one molecule and an electronegative.
What is a hydrogen bond?
500
Found evidence for the existence of negatively charged particles that could be removed from atoms. He called the negatively charged particles electrons.
Who is Thompson?
500
The negatively charged subatomic particle of an atom.
What is a electron?
500
A chemical element with the symbol Mg and atomic number 12. Its common oxidation number is +2. It is an alkaline earth metal and the eighth most abundant element in the Earth's crust and ninth in the known universe as a whole.
What is Magnesium?
500
The substance formed from reactants as a result of a chemical reaction.