
Average Atomic Mass and Periodic Table
Authored by Patricia Weaver
Chemistry
10th Grade
NGSS covered
Used 21+ times

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20 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
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
6.941, Lithium
12.011, Carbon
10.812, Boron
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Naturally occurring chlorine that is put in pools is 75.53 percent 35Cl (mass = 34.969 amu) and 24.47 percent 37Cl (mass = 36.966 amu). Calculate the average atomic mass.
35.46 amu
35.00 amu
37.00 amu
17.00 amu
Tags
NGSS.MS-PS1-1
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Magnesium has three naturally occurring isotopes. 78.70% of Magnesium atoms exist as Magnesium-24, 10.03% exist as Magnesium-25 and 11.17% exist as Magnesium-26. What is the average atomic mass of Magnesium?
14 amu
24 amu
35 amu
Cannot be determined based on information given
Tags
NGSS.MS-PS1-1
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
_____________ are atoms that have the same atomic numbers but differing mass numbers.
ions
isotopes
elements
compound
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Isotopes are elements that have the same number of ____________ but different amounts of ______________.
same electrons but different protons
same neutrons but different electrons
same protons but different electrons
same protons but different neutrons
Tags
NGSS.MS-PS1-1
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which family have the MOST reactive metals?
Halogens
Noble gases
Alkali metals
Transition metals
Tags
NGSS.HS-PS1-1
NGSS.HS-PS1-2
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which family have the MOST reactive NON-metals?
Halogens
Noble gases
Alkali metals
Transition metals
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