Chapter 4 Review (Smith)

Who believed that electrons were scattered amongst positively charged material.

• JJ Thomson
• Ernest Rutherford
• John Dalton
• Niels Bohr

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NGSS.MS-PS1-1

Believed that atoms are small, hard particles that were "indivisible"

• Democritus
• Aristotle
• Schrodinger
• Greek Philosophers

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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.MS-PS1-1

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

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

In a neutral atom, the number of protons equals the number of

• nuclei.

• isotopes.

• electrons.

• neutrons.

Which particles in an atom have a negative electric charge?

• electrons

• neutrons

• protons

An atom of an element with the same number of protons and a different number of neutrons is called

• an ion.

• an isotope.

• a valence electron.

• a metalloid.

What will the atomic mass be for the atom described below?

Number of Protons = 15

Number of Neutrons = 16

Number of Electrons = 15

• 30

• 31

• 46

• 15

Tags

NGSS.MS-PS1-1

If an atom of an element has 15 protons, 15 electrons and 16 neutrons, what will its atomic number be?

• 30

• 31

• 46

• 15

Which element am I?

I am in period 3, and I have five valence electrons.

• arsenic

• boron

• phosphorus

• vanadium