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- 1. Multiple Choice
An atom of chromium has 24 protons, 28 neutrons, and 24 electrons. How many subatomic particles are in the nucleus of a chromium atom?
24
52
48
3
- 2. Multiple Choice
The most abundant element in the earth's crust is
Hydrogen
Nitrogen
Oxygen
Water
- 3. Multiple Choice
Atomic Mass refers to the
number of protons and electrons in an atom
weight of an atom
number of protons in an atom
number of neutrons in an atom
- 4. Multiple Choice
Some atoms have more or less neutrons than protons. These are called
Ions
Cations
Anions
Isotopes
- 5. Multiple Choice
Which set of elements has similar bonding properties?
Kr, Cl, and O
Be, C, and O
K, Ca, and Sc
Cl, Br, and F
- 6. Multiple Choice
When an atom loses or gains an electron, it changes
element.
charge
number of protons.
atomic mass
- 7. Multiple Choice
What chemical symbol represents the element iron?
I
Ir
Au
Fe
- 8. Multiple Choice
The unit of measurement for an atom is an AMU. It stands for atomic mass unit. Which statement is true?
One AMU is equal to the mass of one proton.
One AMU is equal to the mass of one neutron.
One AMU is equal to the mass of one electron.
One AMU is equal to the mass of one proton and one electron .
- 9. Multiple Choice
Where are the most reactive metals located on the periodic table?
the second column from the right side of the table
the rows at the bottom of the table connecting two section
the uppermost complete row of the table
the column at the far left side of the table
- 10. Multiple Choice
What chemical symbol represents the element copper?
Cu
C
Cp
CU
- 11. Multiple Choice
A researcher uses several procedures to separate a rock sample into different chemicals. A mass of 50 grams of one chemical is produced. If this chemical cannot be separated into other chemicals, then it is BEST described as
a mixture
an element
a compound
a solution
- 12. Multiple Choice
A certain atom has 20 electrons, 21 neutrons, and 20 protons. What is the atomic mass of the atom?
20
21
61
41
- 13. Multiple Choice
The chemical symbol for niobium is Nb. Based on its symbol, what can be concluded about niobium?
Niobium is a mixture.
Niobium is a compound.
Niobium is a reactor.
Niobium is an element.
- 14. Multiple Choice
The alkali family is found in the ______________ column of the periodic table.
18th
3rd
1st
13th
- 15. Multiple Choice
The alkaline earth metal elements are in the same family in the periodic table because they all have
8 valence electrons
5 valence electrons
2 valence electrons
1 valence electron
- 16. Multiple Choice
Metals combine chemically with oxygen to form compounds called ____________________
elements
mixtures
solutions
oxides
- 17. Multiple Choice
Sodium, Na, is in the same group as
Ca
K
Mg
Ne
- 18. Multiple Choice
Noble gases are "Inert". What does "inert" indicate?
The atom is un-reactive
The atom's outermost shell is full
The atom resist bonding
All off the above
- 19. Multiple Choice
All matter is composed of atoms and groups of atoms bonded together, called ______________.
Elements
Molecules
Isotopes
Ions
- 20. Multiple Choice
Which part of an atom is involved in chemical reactions?
positively-charged particles
neutrally-charged particles
nucleus and its particles
negatively-charged particles
- 21. Multiple Choice
Element X is a good conductor of electricity. Which of the following MOST likely describes other elements that are good electrical conductors?
all elements that can be combined with X to form covalent compounds
all elements in the same row of the periodic table as X
all elements that can be combined with X to form ionic compounds
all elements in the same column of the periodic table as X
- 22. Multiple Choice
An atom of tin has an atomic number of 50 and a mass number of 119. How many protons, electrons, and neutrons are found in one neutral atom of tin?
69 protons, 69 electrons, 50 neutrons
69 protons, 50 electrons, 69 neutrons
50 protons, 50 electrons, 69 neutrons
50 protons, 69 electrons, 50 neutrons
- 23. Multiple Choice
Ernest Rutherford was an important early researcher in nuclear physics. In one experiment, he observed that particles with a positive charge deflected when passing through a thin sheet of gold foil. What conclusion did Rutherford make in this observation?
Electrons have a negative charge, and protons have a positive charge.
Protons and neutrons are located in the nucleus of an atom.
The positive part of the atom is small and dense.
All atoms have electrons, protons, and neutrons.
- 24. Multiple Choice
Which combination of letters could be used as a chemical symbol for an element?
NaCl
BR
Dy
Cho
- 25. Multiple Choice
Compounds that are combined physically, but not chemically, are called ________________.
pure substances
molecules
elements
mixtures
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