Chapter 9 Understanding the Atom Test Review

What is the charge of a neutron?

Who found that the beam of a cathode ray tube is made of electrons?

Who incorrectly believed that all matter was made of earth, air, fire, and water?

Which isotope has the most neutrons?

What is the charge of a proton?

Who proved/developed the atomic theory?

Which model is this?

The mass number of an element is equal to?

What is the charge of an electron?

Who discovered negatively charged electrons?

What is the nucleus made of?

The atomic number is always equal to?

Who discovered that the nucleus contains neutrons?

How many neutrons does Potassium-39 have?

How many protons does Neon have?

What happens to a neutral atom when it loses an electron?

What happens to a neutral atom when it gains an electron?

This scientist was the first person to describe energy levels of electrons. 

Isotopes of the same element have different numbers of_____________?

Electrons closest to the nucleus have_______ energy compared to those farther from the nucleus.

Who developed this model of the atom?

Who was the Greek philosopher first described atoms?

Who developed this atomic model?

What element is this?

This scientist student shot alpha particles at gold foil to find the nucleus of the atom.