Evolution Of Atomic Theory Flashcards
Each element is composed of extremely small particles called _______.
atoms
Radioactivity was observed by _______.
Henri Bacquerel
Who discovered the three types of radiation?
Ernest Rutherford
The prevailing theory was that of the _______ model, put forward by ________.
“plum pudding”
Thompson
The heaviest known atom has a mass of approximately _________.
4×10^-22g
1 amu
1.66054 × 10^-24g
Atoms of an element with the same number of protons, but a different number of neutrons.
Isotope
Exercise 1: How many protons, neutrons and electrons are in an atom of (a) ¹⁹⁷Au, (b) Strontium 90?
p+. e- n
¹⁹⁷Au. 79. 79. 118
⁹⁰Sr 38. 38. 52
When an atom of a group of atoms loses or gains electrons, it becomes an _____.
ion
______ are formed when at least one electron is lost.
Cations
______ are formed when at least one electron is gained.
Anions
It is the arrangement of electrons in atoms.
Electronic Structure
The light we see with our eyes.
Visible light
Electromagnetic radiation carries energy through space, it is also known as _______.
radiant energy
Distance between two adjacent peaks or troughs.
Wavelength
It is the number of complete wavelengths or cycles that pass a given point each second.
Frequency
It is a display of various types of electromagnetic radiation arranged in order of increasing wavelength.
Electromagnetic Spectrum
It is called energy packets.
Quanta(singular:quantum)
