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Structure of an Atom
Study of Atoms
20
Chemistry
10th Grade
11/16/2008

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Cards

Term
What is an atom?
Definition
smallest particle of an element that retains the properties of an element
Term
Compare and Contrast Daltons and Democritus Ideas
Definition

Democratus- Matter is composed of empty spacce

Dalton- All matter is composed of extreamly small particles called atoms.

Term
What was the expiriment of William Crooks?
Definition
He used a cathode ray, and helped the discovery of electrons.
Term
What is an electron?
Definition
Negatively charged particles that are forms of matter
Term
What did Rutherford discover and how did he do it?
Definition
He discovered a positively charged nucleus, and he did an expiriment where a light goes through a gold foil.
Term
What is a proton?
Definition
It is a subatomic particle carrying a charge equal to but opposite that of an electron, that has a positive charge.
Term
What is a neutron?
Definition
It has a mass equal to the number of protons, but carries no electrical charge
Term
What is an atoms atomic number?
Definition
The number of protons in an atoms.
Term
What is an isotope?
Definition
Atoms with the same number of protons but different numbers of neutrons.
Term
What is the mass number?
Definition
The sum of the number of protons and neutrons in the neucleus.
Term
What is an atomic mass unit?
Definition

Defined as 1/12 the mass of 12 carbon atom

Term
What is a nuclear reaction?
Definition
Reation which involves an atoms nucleus.
Term
What is electromagnetic radiation?
Definition
form of energy that exhibits wavelike behaivor as it travels through space
Term
What is a wavelength?
Definition

What is the shortest distance between equivilent points on a continuous wave.

Term

What is frequency?

Definition
The number of waves that pass a given point per second.
Term
What is the amplitude?
Definition
It is the wave's height from the originto a trough
Term
What is the electromagnetic spectrum?
Definition
encompases all forms of electromagnetric radiation. The colors red, orange, yellow, green, blue, inigo, and violet.
Term
What is the quantum?
Definition
It is the minimum amount of energy that can be gained or lost by an atom.
Term
What is the atomic emision spectrum?
Definition
It is the set of frequencies of the electromagnetic waves emitted by atoms of an element.
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