Unit 3A - Atomic Theory & Structure

If an atom is not neutral (meaning it has a charge), it is called a(n)_.

This is a neutral atom of Nitrogen.

Which of these is a compound?

The mass number is the sum of _.

Which of these is a molecule?

The atomic number is the number of protons in an element?

How many neutrons would be in an isotope of Carbon-14? *atomic # = 6

Thompson's theory explained that there are components of atoms. What was wrong with his theory?

Reading this periodic square, which number tells you the amount of protons that are in this element?

Dalton's theory stated that each element has a unique, indivisible kind of atom. What was wrong with this atomic theory?

You can tell what isotope is most abundant by looking at the atomic mass of an element.

If you change the number of protons you change ___.

If you change the number of neutrons in an atom you change ___.

What element is this?

Which scientist came up with the nuclear model?

Where are the protons of an atom located?

What does percent abundace refer to?

Which scientist came up with the quantum model?

An isotope is a completely different element that has the same number of electrons.

The atomic mass is an average of all the _ of the element.

In addition to the protons, there is another particle found in the nucleus of an atom. These are the electrons.

Which scientist came up with the sphere model?

What would be the mass number of Potassium (K)? *atomic # = 19

How many valence electrons does this Nitrogen atom have?

Which discovery did J. J. Thomson make that improved upon Dalton's atomic theory?

How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain?