Structure of an Atom Flashcard

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

Democratus- Matter is composed of empty spacce

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

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

Defined as 1/12 the mass of 12 carbon atom

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

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

What is frequency?

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

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