Crash Course The Neucleus Flashcards
Which scientist proved the existence of atoms? And how?
Albert Einstein proved the existence of atoms by explaining the movement of pollen in water when viewed under a microscope, a phenomena first observed by Robert Brown. His equation of Brownian motion proved that tiny molecules must be hitting the pollen.
How is the word atom derived
From the Greek for “indivisible”
What are the charges of protons, neutrons and electrons?
Protons are positively charged. Electrons are negatively charged. Neutrons have no charge
What determines the element of an atom?
the number of protons
Why is the symbol of silver AG?
Silver used to be called Argentum. It is also the root of the word Argentina when Spanish conquerors thought mountains of silver were to be found there.
What holds together the centre of an atom?
the strong nuclear force
What is an atoms relative atomic mass?
It is calculated as the number of protons in an atoms plus the number of neutrons averaged across all of the atoms found on earth. (A large number)
What is an isotope.
When an atom is stable at different weights, each one is called an isotope. Isotopes belong on the same place on the periodic table.
What is the mass number
Mass number is just number of protons plus the number of neutrons in an isotope.
