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Flashcards in Unit 3: Deck (8)
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1
Q

Isotopes:

A

Different versions of an element (different # of neutrons / mad #. Same atomic number)

2
Q

How is an isotope more stable?

A

When it has a greater natural abundance

3
Q

How to find average atomic mass:

A

Isotope 1. Isotope2.
Amu = (mass)(%) + (mass)(%)
————————
100

4
Q

What is a mole:

A

A unit consisting of a group of atoms too small to count

5
Q

How much is 1 mole:

A

1 mole = 6.022 x 10 23

6.02214199. Avagadros number

6
Q

Why do we use the mole:?

A

When lab samples contain large #’s of particles which r sometimes too large + inconvenient to work with.

7
Q

Empirical formula:

A

The smallest ratio of atoms in a formula for a compound. (Simplest form)

8
Q

Molecular formula:

A

Gives the actual number of rad atom present in the compound. Molecular is the “true formula”