Unit 2 Test Practice (Atomic Theory)

Compute the average atomic mass for silicon. Type just the mass with correct significant figures. (Do not write the unit, we know it's amu)

Mathematical Equivalence

ON

Tags

NGSS.HS-PS1-7

24.1% of all the isotopes of a an element have a mass of 75.2 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75 amu.
What is the average mass of this element? Type the answer with proper significant figures and do NOT include the unit (we know it's amu).

Mathematical Equivalence

ON

What electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵
• 1s²2s²2p⁴
• 1s²2s²2p⁶
• 1s²2s²2p⁶3s²3p⁶4s²3d¹

Tags

NGSS.HS-PS1-1

How many electrons can the first energy level hold?

• 1
• 2
• 8
• 0

What is incorrect about this orbital diagram?

• Both arrows in the 2p box should be pointing up
• There is nothing incorrect with this diagram
• In the 2p box there should only be 1 electron in the first 2p box and one in the 2nd 2p box
• All the arrows should be pointing up.

Tags

NGSS.HS-PS1-1

Which periodic table family could have electrons filling orbitals in the s-block?

• Alkaline Earth 

• Halogens
• Noble Gases
• Transition Metals

Tags

NGSS.HS-PS1-1

What atom matches this electron configuration?
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰

• Zinc
• Copper
• Nickel
• Germanium

Tags

NGSS.MS-PS1-1

What is the noble gas configuration for Neon?

• [Ne]
• [He]2s²2p⁶
• [F]2p¹
• [Ne]2s²1p⁶

Is the following electron configuration correct? Why or why not?

1s²2s²2p⁶3s²3p⁶4s²4d¹⁰4p⁶5s¹

• No. 4p⁶ should be after 5s¹.

• No. It should be 3d¹⁰ not 4d¹⁰

• Yes. All electrons are represented properly.

• Yes.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The vertical (up and down) columns in the Periodic Table are called

• groups

• towers

• periods

• atomic numbers