Multiple Choice
A proton ___________:
a) Has one positive charge.
b) Has one AMU.
c) Is found in the nucleus of the atom.
d) Only a and b are true.
e) a, b, and c are true.
2. Chemistry
Atoms- Smallest Unit of Matter
Back2. Chemistry
Atoms- Smallest Unit of Matter
- Multiple Choice
The average oxygen atom has a mass number of 16 and an atomic number of 8. This means that the number of neutrons in this oxygen atom is:
a) 24.
b) 8.
c) 16.
d) 4.
e) 2.
- Multiple Choice
How many valence electrons does an atom with five total electrons have?
a) 5.
b) 7.
c) 3.
d) 2.
e) 1.
- Multiple Choice
Which of the following is true about electron energy shells?
a) They represent regions around the nucleus in which the electrons orbit.
b) The shells closest to the nucleus contain electrons with higher energy.
c) They contain electrons of the same energy.
d) a and b only.
e) a and c only.
- Multiple Choice
A neon atom (Ne) is unreactive for which of the following reasons?
a) It has 7 valence electrons.
b) It has 8 valence electrons.
c) Its valence shell is full of electrons.
d) It has 20 valence electrons.
e) b and c only.
- Multiple Choice
How many electrons does an Oxygen atom need to fulfill the octet rule by filling its valence shell?
a) 8.
b) 4.
c) 1.
d) 2.
e) 6.
- Multiple ChoiceWhat is generally true about essential elements and living organisms?
- Multiple ChoiceThe number of protons in an uncharged atom __________.
- Multiple ChoiceWhich of the following subatomic particles has appreciable mass but no charge?
- Multiple ChoiceWhich of the following has negligible mass?
- Multiple ChoiceWhat are the four most abundant elements found in living systems?
- Multiple ChoiceWhich of the following is a trace element?
- Multiple ChoiceIf you were told that concentrations of trace elements above what is required by organisms generally have no effect on those organisms, what would you say?
- Multiple ChoiceThere are __________ naturally occurring elements.
- Multiple ChoiceAn element has eight protons, nine neutrons, and eight electrons. Its atomic number and atomic mass, respectively, are __________.