Question 1 Atoms with the same number of protons, but different number of neutro

Question

Question 1

Atoms with the same number of protons, but different number of neutrons _____.

Question 2

A radioactive element is also known as _____.

Question 3

Which of the following rocks can NOT be dated using isotopes?

Question 4

The age determined for an igneous rock tells us _____.

Question 5

Which of the following time segments represents the longest amount of time?

Question 6

In order for radioactive isotopes to be used as geochronometers to date rocks, the host mineral must _____.

Question 7

If you start with 300 grams of parent atoms, how many grams of daughter atoms will you have after 2 half lives?

Question 8

The oldest rocks on Earth are _____.

Question 9

Isotopes with short half-lives are not useful geochronometers for very old rocks because _____.

Question 10

The graph below is the decay curve for tritium (Hydrogen-3). What percent of activity (i.e., parent) remains after 49 years?

Explanation / Answer

1) are known as isotopes.

2)a parent isotop

parent isotop is the element that undergoes radioactive decay.

3)shale

it is a sedimentary rock, so it cannot give the exact date of formation of rock, since the constituent particles are formed before the rock formation.

4)when the rock cooled and crystallized into a solid

age indicate that when the rock solidified, so that from the trapped radioctive elements and gases we can calculate the age, like Argon.

5) eon

largest subdivision of time on the geologic time scale, phanerozoic eon covers 550 million year long period.

6)have been molten at some point

the age calculated is the time since the solidification of the molten state.

7)75

half life of the radioactive materials, they become half in every half life

8)oceanic crustal rocks found in trenches

the oldest rocks moved and reched at the subduction zone where they moving towards the mantle, they are the oldest and denser rocks.

9)there is not enough radioactive material left to measure

if the half life is too small, the material get decayed fast

10) 12.5%

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.