Structure of the Nuclear Atom 3 - Post

In which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly?

• In, 49 protons, 49 electrons

• Zn, 30 protons, 60 electrons

• Cs, 55 protons, 132.9 electrons

what is an alpha particle

• A hydrogen atom that has lost some of its electrons

• A helium atom that has lost its negative particles

• A hydrogen atom that has lost its protons

• A helium atom that has lost its positive particles

Choose the correct description of J. J. Thomson's Model of an Atom.

• The model is a indivisible and indestructible sphere

• The model is a sphere in which negatively charged particles - electrons- immersed in a positively charged space of the sphere.

• The model is a sphere in which negatively charged particles - electrons- move around the center of an atom creating an electron cloud

• The model is a sphere in which negatively charged particles - electrons - move around the nucleus of an atom in a defined passes, called orbits, like planets around the sun

What is the name of J.J. Thomson's Model of an Atom?

• Jimmy Neutron Model

• Solar System Model

• Plum-Pudding Model

• Quantum mechanical Model

Why did Ernest Rutherford and his colleagues perform the Gold-Foil Experiment?

• They wanted to test and confirm the Plum-Pudding model

• They wanted to test John Dalton's Model

• They were looking for electrons

• They wanted to come up with their own Atomic Model

Tags

NGSS.HS-PS1-8

Choose one of the conclusions that Ernest Rutherford made based on the experimental results of his Gold-Foil experiment

• He concluded that the atom is indivisible

• He concluded that the atom is mostly empty space

• He concluded that the atom has neutrons

• He concluded that the atom is tightly packed with subatomic particles all mixed together

Based on the experimental results of his Gold-Foil experiment, Ernest Rutherford concluded that

• The very dense center of the atom has a positive charge

• The very dense center of the atom has a negative charge

• The very dense center of the atom has no charge

• The atom doesn't have a center and all particles are distributed evenly like in a chocolate chip cookie

Tags

NGSS.HS-PS1-8

Rutherford's gold foil experiment provided evidence that...

• negative and positive charges are spread evenly throughout the atom.
• alpha particles have a positive charge.
• gold is not a dense as previously thought.
• there is a dense positively charged nucleus at the center of an atom.

Tags

NGSS.HS-PS1-8

Rutherford's experiment that he used to discover protons and the nucleus.

• gold foil experiment

• cathode ray experiment

• neither of these is correct

JJ Thomson's experiment that he used to discover electrons

• gold foil experiment

• cathode ray experiment

• neither of these is correct