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IB questions and answers on Atomic Theory

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  • Essay length: 2151 words
  • Submitted: 27/04/2012
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International Baccalaureate Chemistry

The first 200 words of this essay...

IBHL CHEMISTRY I - UNIT 2 PROBLEM SET (TOPICS 2 AND 3) Name: _____________

TOPIC 2 - Atomic Theory

1. What is the atomic number? What information does it provide? # of protons in the nucleus

2. What is the mass number? How is this different from atomic mass? # of neutrons + # of protons for one isotope of one particular atom - atomic mass is the weighted average mass for all of an element's isotopes

3. According to the most current model of the atom, describe the location, charge, and relative mass of protons, neutrons and electrons. A labeled diagram may help.

4. Define isotope. isotopes of an element have the same number of protons but a different number of neutrons; they describe how an element can occur with a variety of mass numbers (same number of protons, but different mass numbers)

5. Four elements are described below:

Element

# of protons

# of neutrons

# of electrons

A

5

6

2

B

1

1

1

C

1

0

0

D

5

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