Ions & Isotopes

Front

How many neutrons are in an atom of carbon-14?

Back

8

Front

How many protons does this isotope of titanium have?

Back

22

Front

How many electrons are in an atom that has an atomic number of 34, an atomic mass of 74 and a charge of -2?

Back

36

Front

Hyphen notation for the isotope with 39 protons and 50 neutrons.

Back

Yttrium-89

Front

Which symbols represent isotopes of the same element?
I. ⁷⁷₃₅X II. ⁷⁷₃₃X III. ⁸¹₃₇X IV. ⁸¹₃₅X

Back

I and IV

Front

Chromium has four naturally occurring isotopes (chromium-50, chromium-52, chromium-53, and chromium-54). What is the average atomic mass of Chromium?

Back

51.996

Front

An element has three isotopes. Given the abundances and relative masses, calculate the average atomic mass and determine (from the periodic table) which element it is.
Abundances | Relative masses 0.005% | 234.04 amu 0.720% | 235.04 amu 99.275% | 238.05 amu

Back

Uranium (#92, Atomic Mass: 238.03 amu)

Front

Which isotope of lead is likely to be the most abundant given the isotopes: lead-204, lead-206, lead-207, lead-208, and an average atomic mass of 207.2?

Back

lead-207

Front

Rubidium has two naturally occurring isotopes, ⁸⁵Rb (relative mass 84.9118 amu) and ⁸⁷Rb (relative mass 86.9092 amu). The abundance of ⁸⁷Rb is 27.8%. If rubidium has an average atomic mass of 85.47 amu, what is the % abundance of ⁸⁵Rb (in percent)?

Back

72.1%

Front

What is the name of the pictured isotope? Options: Carbon-12, Carbon-13, Carbon-14, Carbon-15

Back

Carbon-13