CPC Unit 2 and 3 Sem Exam Review

Front

What is the element with isotopes having masses: 19.992 amu, 20.994 amu, 21.991 amu?

Back

Neon

Front

How do you calculate the atomic mass of an element with multiple isotopes?

Back

Multiply the mass of each isotope by its percent abundance (as a decimal), then sum the results.

Front

What is the atomic mass of Iridium if Iridium-191 has a mass of 191.0 amu (37.58% abundance) and Iridium-193 has a mass of 193.0 amu (62.42% abundance)?

Back

192.4 amu

Front

True or False: The atomic number is equal to the number of electrons in a neutral atom.

Back

True

Front

What was the basis of Dalton’s atomic theory?

Back

It was based on careful measurements and extensive research.

Front

How many neutrons does the isotope Eu-151 have?

Back

88 neutrons.

Front

What is the mass number of an isotope?

Back

The mass number is the total number of protons and neutrons in the nucleus.

Front

Define isotopes.

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

What is the significance of the periodic table in identifying elements?

Back

The periodic table organizes elements by atomic number and groups similar properties.

Front

What does amu stand for?

Back

Atomic mass unit.