Atomic Structure and Periodic Table

How many neutrons in Carbon-14?

• 6
• 7
• 14
• 8

What do these isotopes of carbon all have in common?

• neutrons & mass number
• atomic number and neutrons
• atomic number and electrons
• protons, atomic number, and mass number

Tags

NGSS.HS-PS1-8

What quantities vary between isotopes of an element?

• protons, electrons, and atomic mass
• protons, electrons, and atomic number
• neutrons and electrons
• neutrons and mass number

Tags

NGSS.HS-PS1-8

Calculate the average atomic mass of element X when 34% of element X exists as X-272 and the 66% exists as X-274.

• 185.64amu
• 273.32amu
• 272.68amu
• 27.33amu

An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?

• 9.012, Beryllium
• 12.011, Carbon
• 6.941, Lithium
• 10.812, Boron

Nitrogen has three occurring isotopes: Nitrogen-13, Nitrogen-14, Nitrogen-15. Which isotope is the most abundant?

• Nitrogen-13
• Nitrogen-14
• Nitrogen-15
• Based on the information given, it cannot be determined

Isotopes are atoms of the same element that have the same number of __________ but different number of __________ . Therefore, isotopes of the same element have different masses. 

• protons, neutrons
• protons, electrons
• neutrons, protons
• electrons, protons

Oxygen has 8 protons. What is oxygen's atomic number?

• 16
• 8
• 15.999
• 0

Tags

NGSS.MS-PS1-1

Do the following atoms belong to the same element? Explain.
       Aluminum-27      &
 an atom with 14 p⁺ and 13 n⁰

• Yes because they have the same number of protons
• Yes because they have the same mass
• No because they have different number of protons
• No because they have different number of neutrons

Tags

NGSS.MS-PS1-1

How many protons are in this element?

• 79
• 196
• 117
• Cannot be determined

Tags

NGSS.HS-PS1-1