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Who stipulated that electrons orbit the nucleus at fixed energies and distances?
Niels Bohr
The electron was discovered in 1897. Who discovered it, Thompson or Schrodinger?
Thompson
Democritus called the tiniest particles of matter "atomos", which is Greek for _____
indivisible, unbreakable
Who first proposed that everything in the world was made up of tiny particles, Dalton or Democritus??
Democritus
What are the 3 particles that make-up an atom?
Protons, neutrons and electrons
How many total electrons does carbon have?
6
What is the number of protons that the element in this image contain?
7
What does the nucleus consist of?
Protons and neutrons
A particle that moves around the nucleus is a(n)...
electron
"C" is the element symbol for which element?
Carbon
How many electrons are in the element oxygen?
8
How many protons are in the element sodium?
10
Electrons have what type of charge?
Negative
The positive particles of an atom are...
protons
The central region of an atom where its neutrons and protons are is its...
Nucleus
An atom with atomic number 6 would have how many protons?
6
The particle in an atom that is neutral and have no charge is...
Neutron
What is the basic building block for all matter in the universe?
atom


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