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- 1. Multiple Choice
An element is made up of
one type of atom
two types of atoms
three types of atoms
more than three types of atoms
- 2. Multiple Choice
When 1 carbon atom combines with 2 oxygen atoms, the resulting substance is called a(n)
element
compound
isotope
ion
- 3. Multiple Choice
Which statement accurately describes the chemical symbol of an element?
The chemical symbol is always a single letter.
The chemical symbol always starts with the same letter as the name of the element.
The chemical symbol always begins with a capital letter.
The chemical symbol can be shared by more than one element.
- 4. Multiple Choice
The element copper has 29 protons. What is the atomic number of copper?
29
18
21
22
- 5. Multiple Choice
An electron in the first energy level of the electron cloud has ______________ an electron in the third energy level.
a lower energy than
a higher energy than
the same energy as
- 6. Multiple Choice
An isotope has the same number of ____ but a different number of ____ than the other atoms of the same element.
protons, neutrons
neutrons, protons
electrons, protons
neutrons, electrons
- 7. Multiple Choice
An isotope of the element fluorine has 9 protons and 10 neutrons. What is the name of this isotope?
Remember the number at the end of an isotope's name is the mass number.
fluorine-19
fluorine-21
fluorine-1
fluroine-2
- 8. Multiple Choice
When electrons are lost, a _______ ion is formed.
positive
negative
neutral
- 9. Multiple Choice
When electrons are gained, a _______ ion is formed.
positive
negative
neutral
- 10. Multiple Choice
The aluminum atom __________ electrons to form a positive ion.
loses
gains
neither gains nor loses
- 11. Multiple Choice
What is the name of the aluminum ion?
Al–1
Al+2
Al–3
Al+3
- 12. Multiple Choice
What can be added to an atom to cause a non-valence electron in the atom to temporarily become a valence electron?
energy
mass
neutrons
electrons
- 13. Multiple Choice
Uranium is an element that is often used in nuclear power plants. Uranium atoms are very large, and the substance can be dangerous if it is not carefully contained. What is true about all uranium atoms?
They each have the same number of nuclear particles.
They each have the same number of neutral particles.
They each have the same number of neutrons.
They each have the same number of protons.
- 14. Multiple Choice
How many electrons are in the third energy level?
2
8
18
20
- 15. Multiple Choice
All atoms of the element potassium have 19 protons. One of the most stable types of potassium atoms has the mass number 39. How many neutrons make up one of these potassium atoms?
mass number = protons + neutrons.
19
20
38
58
- 16. Multiple Choice
Scientists are working with a liquid that is made of only one type of atom. Which statement correctly describes this liquid?
The liquid contains only one compound.
The liquid contains only one element.
The liquid contains only neutral electrons.
The liquid can be broken down into simpler substances.
- 17. Multiple Choice
What is the number at the end of an isotope’s name?
atomic number
neutron number
mass number
electron number
- 18. Multiple Choice
Which are different forms of an element that have different numbers of neutrons?
ions
isotopes
compounds
molecules
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