Phosphorus
phosphorus
Practical often means tangible and useful, and a benefit is something gained. So if something is a practical benefit, it is something that can help you in a meaningful way.
Secretary jobs are actually the most practical to telecommute to. But temp jobs are often included as well.
Not usually, but the closely similar element chlorine often is.
As often as is practical and as varied as possible.
Strotium
chromium
Mercury
No. The most common isotope(s) of an element are often stable.
Tungsten is an element often found in cheaper light bulbs.
Teens often feel that they are not accomplishing anything in school and are wasting their time studying things that don't interest them anyway, and seem to have little if any practical application to the problems of their lives. No family support. Low self-estm. Pregnancy
No. You have to change the number of protrons.(Changing the number of neutrons changes the isotope of the element, but it is still the same element. However, changing the number of neutrons will often result in instability, causing a radioactive decay sequence, which often results in a change in element.)