A radionuclide has a half life of 10 minutes. If the amount of radionuclide is initially 100 g, how many grams would remain after 30 minutes?

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NGSS.HS-PS1-8

If we wanted to find the age of an animal known to exist billions of years ago, would we want to use a radionuclide with a half life of 10 minutes?

• Yes, the half life is perfect!

• No, the half life is too long!

• No, the half life is too short!

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NGSS.HS-PS1-8

Calcium, which is atomic number 20, has ____ electrons.

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NGSS.HS-PS1-1

Isotopes differ from one another based on their amount of __________.

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NGSS.HS-PS1-8

If Bromine has 35 protons and a mass of 80, how many neutrons does it have?

• 35

• 115

• 45

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NGSS.MS-PS1-1

An atom has 25 protons and 30 neutrons in its nucleus. What is the mass of the atom?

How many neutrons does Na - 21 have?

• 21

• 12

• 11

• 10

What is wrong with using a radionuclide with too long of a half life?

• Too much parent isotope will decay into daughter isotope.

• Too little parent isotope will decay into daughter isotope.

• The rock or fossil you are looking at might be billions of years old.

• There is nothing wrong with using a radionuclide with too long a half life.

Tags

NGSS.HS-PS1-8

The half life of Mercury-203 is 47 days. How long are two half lives of Mercury-203?

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NGSS.HS-PS1-8

If I'm trying to find the age of a fossil believed to be around 3000 years old, which radionuclide would be the best to use?

• Sodium - 24 with half life of 15 hours

• Iodine - 129 with half life of 15,700,000 years

• Radium - 226 with half life of 1600 years

• Copper - 62 with half life of 10 minutes