Question 1

If an element has a half-life of one hour, then from the time it is created, it will last ______.

Accepted Answer

two hours

Answer

one hour

Answer

four hours

Answer

half an hour

Question 2

The first artificial element to be created was ______.

Accepted Answer

neptunium

Answer

dubnium

Answer

mendelevium

Answer

plutonium

Question 3

An element’s atomic number depends on ______.

Accepted Answer

the number of protons in its nucleus

Answer

the number of neutrons it contains

Answer

its atomic weight

Answer

the sequence in which it was discovered

Question 4

Which of the following sentences uses the word applications in the same way it is used in paragraph F?

Accepted Answer

Barium compounds are mainly used in fireworks and as a lubricant for oil well equipment, but they have several other applications as well.

Answer

You will need several applications of this salve every day to cure your rash.

Answer

Web browsers, word processing software, and spreadsheets: These are among the most important computer applications ever developed

Answer

She filled out more than a dozen applications for master’s degree programs.

Question 5

The author mentions that scientists from the Dubna laboratory were gathering mushrooms in the early 1990s because ______.

Accepted Answer

they did not have enough money to buy food

Answer

mushrooms contained a chemical they required

Answer

gathering mushrooms was a good way to relax

Answer

the government required them to do so

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