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AVERAGE ATOMIC MASS

Total questions: 20

Worksheet time: 20mins

Name

Class

Date

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?

74.92 amu

24.97 amu

75.01 amu

74.51 amu

An element with 4.35% have a mass of 49.9461 amu, 83.79% have amass of 51.9405 amu, 9.50% have a mass of 52.9407 amu, and 2.36% have a mass of 53.9389amu.

51.99 amu

52.19 amu

53.45 amu

17.33 amu

4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?

41.97 amu

42.19 amu

10.43 amu

40.04 amu

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

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
How many protons does this element have?

no way to know

Calculate the average atomic mass of this element.

106.38649amu

111.91896amu

107.8677amu

121

Compute the average atomic mass for this element.

27.977

28.09

28.976

The average mass cannot be determined from provided information.

Calculate the average atomic mass of the element using the following data:

[Isotope / % abundance]

[X- 54 / 6% ] [X- 56 / 92% ] [ X-57 / 2% ]

53.7 amu

54.9 amu

5592.0 amu

55.9 amu

An element exists as the three isotopes shown. What is the average atomic mass?

20.74 amu

22.56 amu

18.39 amu

24.31

10.

An isotope has three forms. 30% have a mass of 4 amu, 20% have a mass of 5 amu and 50% have a mass of 3 amu. Average atomic mass will be closest to

2 amu

3 amu

4 amu

5 amu

11.

What is the name of the atom pictured here?

Nitrogen

Nitrogen-15

Nitrogen-7

Nitrogen-8

12.

Which of the following could have 82 neutrons?

W-182

Ta-181

Cs-132

Ba-138

13.

If X is the symbol for an element, which of the following two symbols represent isotopes of the same element?
I. ⁷⁷₃₅X II. ⁷⁷₃₃X III. ⁸¹₃₇X IV. ⁸¹₃₅X

I and II

III and IV

I and IV

I and III

14.

All of the following are found in the nucleus EXCEPT

Proton

Neutron

Electron

There are no exceptions. All are found in the nucleus

15.

What is the identity of the atom?

Aluminum

Silicon

Cobalt

Zirconium

16.

Which is the best nuclear symbol for a potassium atom with 21 neutrons?

17.

Which of the following is the nuclear symbol for lithium-6

18.

The correct hyphen notation for the nuclear symbol given is

chromium - 24

chromium - 50

chromium - 74

chromium - 26

19.

The hyphen notation of an atom of calcium with 20 protons, 20 electrons, and 22 neutrons is

calcium - 20

calcium - 40

calcium - 62

calcium - 42

20.

The number 84 in strontium - 84 represents

the atomic number

the mass number

the average atomic mass

the number of electrons

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AVERAGE ATOMIC MASS

Total questions: 20

Worksheet time: 20mins

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