Lab: Half-Life

Question 1

Use the periodic table and what you know about mass numbers to complete each statement.U-238 has protons and146 neutrons.

Revolt · Accepted Answer

92

Question 2

A particular isotope of plutonium has 94 protons, neutrons, and a mass number of 241.

Revolt · Accepted Answer

147

Question 3

Thorium- has 90 protons and 137 neutrons.

Revolt · Accepted Answer

227

Question 4

Determine which decay process is being described in each case.The atomic number deceases by one, and the atomic mass is unchanged.

Revolt · Accepted Answer

beta-plus decay

Question 5

The atomic number decreases by two, and the atomic mass decreases by four.

Revolt · Accepted Answer

alpha decay

Question 6

The atomic number increases by one, and the atomic mass remains unchanged.

Revolt · Accepted Answer

beta-minus decay

Lab: Half-Life Answers