1 & 2: The Nuclear Atom and Atomic Properties

Question 1

Proton

Answer 1

Subatomic positive charge

Question 2

Neutron

Answer 2

Subatomic neutral charge

Question 3

Electron

Answer 3

Subatomic negative charge

Question 4

1 amu

Answer 4

1.6606 * 10^(-24) g.

Question 5

Ion

Answer 5

Non-neutrally charged atom

e.g. (NO3-)

Question 6

Isotope

Answer 6

Variations of an element based on different number of neutrons

e.g. (Carbon-12, Carbon-13, Carbon-14)

Question 7

Atomic Number

Answer 7

Determines element on periodic table and the number of protons

Question 8

Isotopes have what in common?

Answer 8

Number of protons but not neutrons

Question 9

Isotopic abundance

Answer 9

Varies and is used to calculate the average mass of elements on the periodic table.

Question 10

How many atoms will have the amu found in the periodic table?

Answer 10

Zero, since it is an “average” of other masses based on abundance.

Question 11

Mass of a molecule

Answer 11

AMU

Question 12

Mass of a mole

Answer 12

Avagadro’s Constant * molecule amount

Question 13

Mass of one AMU

Answer 13

1.6606 * 10^(-24)

Question 14

Does having the same mole quantity mean the same mass? number of molecules?

Answer 14

Different mass depending on the mass of each mole. Same number of molecules - this is Avogadro’s number although mass of each molecule (AMU) will differ.

Question 15

How to find molar mass?

Answer 15

Find the masses of each individual element.

Question 16

Two interpretations of the atomic mass:

Answer 16

• AMU of a single molecule of the element
• Mass in grams within one mole of the element.