Which statement best describes an electron?

Smaller mass than a proton and a negative charge

Smaller mass than a proton and a positive charge

Greater mass than a proton and a negative charge

Greater mass than a proton and a positive charge

Which statement about the atomic nucleus is correct?

The nucleus is made of protons and neutrons and has a positive charge

The nucleus is made of protons and neutrons and has a negative charge

The nucleus is made of electrons and has a positive charge

The nucleus is made of electrons and has a negative charge

Which device did JJ Thomson use to discover the electron?

scanning tunneling electron microscope

In what location did Rutherford suggest the electrons were located?

only where the alpha particles were deflected.

outside the atom after they collided with the alpha particle.

Which is a finding attributed to Rutherford's Gold Foil Experiment?

atoms are mostly empty space with a dense positive nucleus.

atoms are indivisible and have a dense positive nucleus.

atoms are divisible and have multiple layers of electrons scattered uniformly about the atom.

atoms are like plum pudding with positive and negative charges uniformly scattered throughout the atom.

What evidence did Rutherford use to support the idea that the atom was mostly empty space?

the vast majority of the alpha particles went through the foil unaffected.

the vast majority of the alpha particles were deflected at 90 degrees.

one alpha particle was deflected by the gold foil.

beams of alpha particles were deflected by magnets.

The atomic number of aluminum is 13. Do the following atoms belong to the same element? Explain Element #1= Aluminum-27 Element #2= An atom with 14 protons and 13 neutrons

No because they have different number of protons

Yes because they have the same number of protons

Yes because they have the same mass

No because they have different number of neutrons

What's a valence electron?

electrons in the outermost energy level

electrons in the second energy level

How does Bohr's model of the atom differ than Rutherford's model?

Bohr's model focused on the arrangement of electrons within the atom. Electrons moved around the nucleus like planets around the sun.

Bohr believed that neutrons and protons were located in the nucleus of the atom

Bohr believed that electrons were in the center of the atom with protons and the neutrons were orbiting the nucleus.

Bohr believed that there was a 4th subatomic particle that couldn't be found-but was there.

a region of space outside of the nucleus where electrons are likely to be

a region of space inside the nucleus where neutrons are likely to be

the probable location of a proton within the atom

the probability of having electrons within the atom

Atoms

Authored by Julie Keller

Chemistry

9th - 10th Grade

NGSS covered

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MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The positive particles of an atom are

electrons

positrons

neutrons

protons

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

all matter is made of what

energy

atoms

electrons

compounds

the central region of an atom where its neutrons and protons are is its

nucleus

electron cloud

core

center

an atom with atomic number 6 would have how many protons

cannot be determined

Particles in an atom that are neutral and have no charge are

negatrons

electrons

neutrons

protons

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What is the atomic number for an element with three protons?

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

An atom's mass number equals the number of...

protons plus the number of electrons

protons plus the number of neutrons

protons

neutrons

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Atoms

The positive particles of an atom are

all matter is made of what

the central region of an atom where its neutrons and protons are is its

an atom with atomic number 6 would have how many protons

Particles in an atom that are neutral and have no charge are

What is the atomic number for an element with three protons?

An atom's mass number equals the number of...

Which statement best describes an electron?

Which statement about the atomic nucleus is correct?

What charge does an Electron have?

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