Chapter 2 Section 9: Chem to go

If lithium loses an electron to become Li+, what is the average atomic mass of the lithium ion?

• 6.02 amu

• 7.86 amu

• 5.43 amu

• 6.94 amu

Hydrogen has three isotopes with mass numbers of 1, 2, and 3.

Select the complete chemical symbol for each isotope.

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Select the complete chemical symbol for the element that contains 16 protons, 16 electrons, and 17 neutrons.

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Use the periodic table to complete the table:

Upload a picture of your completed table.

Neutrons can be used to bombard the nucleus of an atom like uranium.

Why would it be more difficult to inject the nucleus of uranium with a proton?

• Protons are too small to effectively bombard the nucleus of uranium.
• Protons are positively charged and would experience repulsion from the positively charged nucleus of uranium.
• Protons are neutral particles and cannot interact with the nucleus of uranium.
• Protons are not capable of carrying enough energy to penetrate the nucleus of uranium.

Complete the following reaction:

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Radon is a threat to the health of people in their homes. It emits radioactive particles at a significant rate. Complete the following radioactive decay equation:

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Why a helium atom is able to exist? What keeps the two electrons, two protons, and two neutrons together?

• Electrostatic coulomb attractive force and strong nuclear force

• Magnetic force and chemical bonding
• Friction and electronic force

• Gravitational force and weak nuclear force

Which of the following may be used to decrease the half-life of a radioactive isotope?

• increase surface area

• increase concentration

• increase temperature

• not listed here

What percent of a radioactive isotope would remain after two half-lives?

• 25.0

• 50.0

• 6.25

• 12.5