Chapter 4 Test Chemistry

Which subatomic particle has the least mass?

The word to describe energy levels, in which energy emissions are a certain QUANtity.

First model to include different masses for different elements

States that it is impossible to know the energy and position of an electron at the same time

Has the same number of protons, but a different number of neutrons

To find out the number of _?_ in an isotope, subtract the atomic number from the mass number

The atomic number is equal to the number of _?_ in an atom.

First to refer to matter as discrete particles

How many neutrons are in the following isotope?

An atom has the most stable chemical configuration when it has _?_ electrons

A charged atom is called a(n) _?_.

Whose work with spectroscopy helped to develop the planetary model of the atom?

If an atom loses electrons, it will have a _?_ charge.

The _?_ equals the number of protons in an atom.

Who conducted the gold foil experiment that led to the nuclear model of the atom?

Electron dot notation gives a depiction of the _?_ electrons.

J.J. Thomson discovered the _?_.

Who identified and named the proton?

The _?_ is determined by the weighted averages of isotopes of an element.

Which subatomic particle has the most mass?

The electrons in the outermost energy level or energy shell are called _?_ electrons.

The central, positively charged portion of an atom

What is the mass number of the following isotope?

Who discovered the neutron?

How many protons in the following atom?