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Please I need Chemistry help!?

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Please I need Chemistry help!?

Postby hagaleah » Fri Nov 18, 2011 10:01 am

1. Unless otherwise instructed, you may use the periodic table in the Chemistry: Problems and Solutions book for this test.

What was the key characteristic by which Dmitri Mendeleev arranged his periodic table?
(Points : 3)
increasing atomic mass

increasing atomic number

electron configuration

type of element


2. What is the primary characteristic by which the modern periodic table is arranged?
(Points : 3)
increasing atomic mass

date of discovery

increasing atomic number

chemical and physical properties


3. What does the periodic law state?
(Points : 3)
When elements are arranged in order of increasing atomic size, there is a recurring pattern to their physical and chemical properties.

When elements are arranged in order of increasing atomic number, there is a recurring pattern to their physical and chemical properties.

When elements are arranged in order of increasing atomic mass, there is a recurring pattern to their physical and chemical properties within a group.

When elements are alphabetized, there is a periodic pattern to their physical and chemical properties within a period.


4. What is true of elements in a period on the periodic table?
(Points : 3)
They have different properties that repeat across the next period.

They have similar properties that repeat across the next period.

They have similar names.

They have different properties that show no pattern.


5. Which element has the same number of energy levels as krypton (Kr) and the same number of valence electrons as nitrogen (N)?
(Points : 3)
iron (Fe)

arsenic (As)

selenium (Se)

calcium (Ca)


6. Which element has four energy levels?
(Points : 3)
rubidium (Rb)

cesium (Cs)

potassium (K)

sodium (Na)


7. Which of the following elements has the most properties in common with molybdenum (Mo)?
(Points : 3)
manganese (Mn)

iron (Fe)

vanadium (V)

chromium (Cr)


8. Which element has the same number of valence electrons as oxygen (O)?
(Points : 3)
fluorine (F)

sulfur (S)

nitrogen (N)

neon (Ne)


9. What happens to the atomic size of the elements as one goes from the bottom to the top of a group?
(Points : 3)
Atomic size stays the same as one moves from bottom to top in a group.

Atomic size decreases as one moves from bottom to top in a group.

Atomic size increases as one moves from bottom to top in a group.

Atomic size changes randomly as one moves from bottom to top in a group.


10. Which of the following places the elements in the correct order of increasing first ionization energy?
(Points : 3)
Ca, Mg, Be

F, O, N

Li, Na, K

Si, P, S


11. Which of the following has the largest atomic radius: F, F, Cl, or Cl?
(Points : 3)
F

F

Cl

Cl


12. Which of the following has the greatest first ionization energy: Li, Be, B, or C?
(Points : 3)
Li

Be

B

C


13. How did Dmitri Mendeleev deal with elements that had not yet been discovered?
(Points : 3)
He left blanks for them in his periodic table, as he predicted they would be discovered.

He gave them names and properties and placed them in the table.

He created them in his laboratory and placed them in the table.

He ignored them, placing them in the table and shifting others when they were discovered.


14. Which of the following elements have properties similar to those of astatine (At)?
(Points : 3)
F, Br, I

Ar, S, P

F, Ar, Ne

Na, Mg, Al
hagaleah
 
Posts: 12
Joined: Thu Mar 31, 2011 8:04 pm

Please I need Chemistry help!?

Postby langford59 » Fri Nov 18, 2011 10:04 am

1. increasing atomic mass


2. increasing atomic number


3. When elements are arranged in order of increasing atomic mass, there is a recurring pattern to their physical and chemical properties within a group.



4. They have similar properties that repeat across the next period.



13. He left blanks for them in his periodic table, as he predicted they would be discovered
langford59
 
Posts: 8
Joined: Thu Mar 31, 2011 6:45 pm


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