Unit 2 Particles

Who was the first person to "think" of an atom?

• Democritus

• J.J. Thompson

• Rutherford

• Bohr

Which one of these is Dalton's Model?

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NGSS.MS-PS1-1

Matter always has mass.

• true
• false

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NGSS.MS-PS1-1

What is a particle with one positive charge called?

• proton

• electron

• neutron

• quark

Which model was created after the discovery of the electron cloud?

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Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Look at this picture of Argon off the periodic table. Which of the following is true for this element?

• 18 protons

• 40 protons

• 22 protons

• 21.9 protons

Tags

NGSS.HS-PS1-1

The nucleus of an atom is made of

• electrons and protons
• electrons and neutrons
• protons and neutrons
• empty space

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NGSS.HS-PS1-8

NGSS.HS-PS1-4

If an atom contains exactly three protons, then it's an atom of _____

• lithium
• gold
• nitrogen
• carbon

Tags

NGSS.HS-PS1-1

For an atom to be electrically neutral, it must contain the same number of _____

• protons and neutrons
• neutrons and electrons
• protons and electrons
• nucleons and electrons

Tags

NGSS.HS-PS1-7