What were John Dalton two contributions to atomic history?

• Created the atomic theory

• Discovered that the atom is mostly empty space

• Believed that atoms cannot be rearranged during chemical reactions

• Hypothesized that the atom is a tiny, hard sphere

• Discovered the electron

What subatomic particles make up the nucleus of an atom?

• electrons

• protons

• neutrons

• leptons

• mesons

Tags

NGSS.MS-PS1-1

Discovered that the atom has a small, dense, positively charged nucleus.

• Ernest Rutherford
• Heisenberg
• Democritus
• JJ Thomson

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NGSS.HS-PS1-8

Believed that all atoms of the same element would be the same.

• John Dalton
• JJ Thomson
• Niels Bohr
• Modern Atomic Theory

Who was the first to propose that matter consist of indivisible particle of matter called atoms?

• John Dalton

• Aristotle

• Democritus

• Plato

Ernst Rutherford discovered which part of the atom through the use of gold foil?

• nucleus

• Neutron

• Electron

• Orbitals

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NGSS.HS-PS1-8

Which of the following is the best analogy for Thomson's model of the atom?

• marble

• plum pudding

• solar system

• ripple in water standing still

Ultimately, Schrodinger's model had electrons in ______ around the nucleus

• Specific orbits

• Nodes

• Waves

• Clouds

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NGSS.HS-PS4-3

DeBroglie is remembered for their contributions to understanding this about electrons:

• they can only exist at specific energy levels

• they can behave like a wave

• they have a property called spin

• they have negative charge

Tags

NGSS.HS-PS4-3

Ernest Rutherford discovered that atoms were mostly _________________. 

• negatively charged
• positively charged
• electrons
• empty space.