Structure and Stability of Atoms Flashcard

Chemical Compound
Substance formed when the atoms of more than one element combine.
Chemical Formula
A formula that lists the elements of a compound using subscripts to indicate the number of atoms of each element
Chemical Equation
A format for writing a chemical reaction listing reactants on the left, products on the right, and drawing an arrow between them.
Law of Mass Conservation
A law that states “Mass is neither created nor destroyed in chemical reactions.”
Law of Definite Proportions
A law that states “Different samples of a pure compound always contain the same proportion of elements by mass.”
Law of Multiple Proportions
A law that states “Elements can combine in different ways to form different chemical compounds, with mass ratios that are small whole-number multiples of each other.”
Avagadro’s Number
NA, The number of atoms in 1 mole of an element.
Mole
The amount of an element whose the mass in grams is equal to the atomic mass of that element.
Molar Mass
The mass in grams of an element per 1 mole.
Nuclear Chemistry
The study of the properties and changes to atomic nuclei.
Nuclear Equation
An equation that represent a nuclear change of one element or isotope into another element or isotope
Radioisotope
An isotope of an element that undergoes radioactive decay.
Alpha Particle
A helium nucleus consisting of two protons and two neutrons with a +2 charge.
Beta Particle
An electron emitted through radioactive decay
Beta Decay
Radioactive decay where a neutron breaks down into a proton and an electron; emitting the electron from the nucleus.
Alpha Decay
The decay of an isotope where a Helium nucleus (two protons and two neutrons) is ejected. Common for heavy radioactive isotopes like Uranium-238.
Gamma Radiation
Electromagnetic radiation of very high energy. Almost always accompanies other forms of radiactive decay. Does not change the atomic or mass number of an isotope.
Positron Emission
Radioactive decay where a proton breaks down into a neutron and a positive particle with the mass of an electron. The positively charged particle is ejected frm the nucleus.
Electron Capture
Process where an electron is absorbed into the nucleus to combine with a proton to form a neutron.

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