When the mass number decreases by four and the atomic number decreases by two.

It increases the number of protons while decreasing the number of neutrons.

Other nuclei are unstable because they have too few neutrons relative to the number of protons. These nuclei increase their stability by converting a proton to a neutron.

I - Nuclei that have an atomic number greater than 83 are radioactive.

II - These nuclei have both too many neutrons and too many protons to be stable.

During nuclear decay, if the atomic number decreases by one but the mass number is unchanged, the radiation emitted is

is the time required for one-half of the nuclei in a radioisotope sample to decay to products.

Uranium compounds are found in rocks and in soils that form from these rocks. How can these uranium compounds lead to a buildup of radon in homes and other buildings?

Which of the following always changes when transmutation occurs?

to get the number of neutrons

I - The neutron-to-proton ratio in a radioisotope determines the type of decay that occurs.

II - After each half-life, half of the original radioactive atoms have decayed into atoms of the same element.

I - The neutron-to-proton ratio in a radioisotope determines the type of decay that occurs.

II - After each half-life, half of the original radioactive atoms have decayed into atoms of a new element.

I - Transmutation can occur by radioactive decay, or when particles bombard the nucleus of an atom.

II - After each half-life, half of the original radioactive atoms have decayed into atoms of a new element.

an attractive force that acts between all nuclear particles that are extremely close together, like protons and neutrons in a nucleus

Describe COHESION.

any substance that interferes with the hydrogen bonding between water molecules and thereby reduces surface tension; soaps and detergents are surfactantsany substance that interferes with the hydrogen bonding between water molecules and thereby reduces surface tension; soaps and detergents are examples of these

The hydrologic cycle is:

begins at the Earth's surface and extends up to 4-12 miles (6-20 km) high. This is where we live. As the gases in this layer decrease with height, the air become thinner. Therefore, the temperature in the troposphere also decreases with height. As you climb higher, the temperature drops from about 62°F (17°C) to -60°F (-51°C). Almost all weather occurs in this region.

This atmospheric layer absorbs most of the damaging ultraviolet sunlight (UV-B)

This layer of the atmosphere would still feel very cold to our skin because of the extremely thin air. The total amount of energy from the very few molecules in this layer is not sufficient enough to heat our skin.

  It is _____ to breath on top of a mountain than at sea level because there are ______ oxygen molecules at the summit.

These are the pollutants that are emitted directly from the sources such as volcanic eruptions, combustion of fossil fuel, etc. These include nitrogen oxide, sulphur oxide, etc.

This pollution results in neurological and behavioral disorders in humans. Insomnia, memory loss, headaches, and tremors are some of the symptoms.

If you feel the heat in the handle of a cooking pot, that heat was transferred to the handle by:

The  brief cloud that forms when you exhale on a cold winter day was formed because of:

If your employees have a company email address, make sure that everyone gets an email outlining safety standards at least once a month. Another way is mailing a newsletter to the address of every employee; you can include one with their pay stub as well.

Place a sign where employees punch in, in break rooms, around equipment and any other high frequent areas. Be creative! Use video and other mediums to help reinforce standards.

A picture is worth a thousand words. Make it perfectly clear what the expectations are by taking pictures of employees demonstrating proper practices. Include these in your newsletters and emails.

To ensure that everyone is getting the message, hold small-group meetings that are mandatory for all employees. Make Toolbox Talks a part of the daily routine to review and discuss safety standards.

I. A HOT WORK permit must be obtained prior to beginning HOT.work by welders and contractors before beginning a job.

II. A HOT WORK permit is not necessary if just burning and grinding is being done on a job.

I. Contractors are not required to obtain HOT WORK permits.

II. 35 feet is a good safe distance for covered combustibles to be away from HOT WORK.

I. The employee or contractor will obtain a HOT WORK permit from his supervisor and must determine if conditions are safe and have a fire watch if necessary.

II. HOT WORK is permitted in explosive atmospheres, around hazardous tanks and equipment.

I. The following protective measures can be used: damp sand on floors, protective shields, or fire resistant coverings while Hot Work is taking place.

II. Fully charged and operable fire extinguishers and/or hose lines shall be available and ready.

I. The fire watch does not have to be trained in fire extinguishing and is not responsible for sounding an alarm in the event of a fire.

II. The HOT WORK permit shall be posted at the job site, and the supervisor shall retain the permit for three (3) days.