1. The average atomic weight of copper, which has two naturally occurring isotop

Question

1. The average atomic weight of copper, which has two naturally occurring isotopes, is 63.5. of the isotopes has an atomic weight of 62.9 amu and constitutes 69.1% of the copper isotopes. The other has an abundance of 30.9%. The atomic weight (amu of the second isotope is amu. A) 63.2 amu B) 63.8 amu C) 64.1 amu D) 64.8 amu E) 28.1 amu 2. When energy level drawings are constructed the electrons are placed first in the 1s then the 2s then the 2 p. This building up is called: A) Aufbau Principle B) Pauli Exclusion Principle C) Hund's Rule D) Electronegativity Principle E) Planck's Theory 3 which one of the following formulas is incorrect because it does not represent a know ionic compound

Explanation / Answer

1 D 64.5

63.5*100= 62.9*69.1 + m*30.9

m= 64.8

2 A afbau principle

The rule is based on the total number of nodes in the atomic orbital, n + ?, which is related to the energy

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