Organic Chemistry Answers

organic particulates example

A mineral contains 14.7% calcium and tungsten the remainder is oxygen find its emperical formula

An intrinsic semiconductor has

1. a large number of impurities

2. an excess of electrons

3. an excess of holes

4. none of the above

5. all of the above

A trivalent atom is also called

1. a metal

2. a semiconductor

3. a donor

4. an acceptor

5. None of the above

The valence electron of a copper atom experiences what kind of attraction toward the

nucleus?

1. Strong

2. Weak

3. None

4. impossible to say

5. All of the above

What is the maximum number of electrons that can exist in the shell closest to the

nucleus of an atom?

1. 1

2. 2

3. 4

4. 8

5. 3

The isotopes of magnesium, 24Mg and 25Mg, both form ions with charge 2+. Which of

12 12

the following statements about these ions is true?

A Both ions have electronic configuration 1s2 2s2 2p6 3s2

B 25Mg2+ has more protons than 24Mg2+. 12 12

C The ions have the same number of electrons but different numbers of neutrons.

D The ions have the same number of neutrons but different numbers of protons.