Protons, Neutrons, and Electrons

If an atom has 12 protons, 13 neutrons, and 12 electrons, what is the charge of the atom?

0

What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom that has a mass number of 112?

160

What is the difference between the number of electrons in an atom of selenium, Se, and the number of electrons in an atom of aluminum, Al?

21

Which of the elements have the largest number of neutrons?

Calcium

In the early 1900s many scientists thought that the atom consisted of a positive substance with negative charges scattered throughout the substance. Then Ernest Rutherford completed an experiment that changed the concept of an atom. His discovery led to the understanding that an atom consists mostly of empty space with-

Electrons orbiting a dense nucleus made of protons and neutrons

Which best describes the nucleus of an atom?

It is a centrally located structure making up almost all of the atomic mass and having an overall positive charge

Describe the structure and location of a Electron.

Negative, 0 AMU, Electron Cloud

Describe the structure and location of a Neutron.

Neutral, 1 AMU, Nucleus

Describe the structure and location of a Proton.

Positive, 1 AMU, Nucleus

Which statement correctly describes the location and charge of the electrons in an atom?

The electrons are outside the nucleus and have a negative charge.