# Line graphs and radiometric dating for kids

### Graphing Half Life WS

Radiometric Dating and the Geologic Time Scale, The Talk Origins Archive. of isochron (radiometric) dating (some technical), equations, graphs, Content information from on-line encyclopedia that explains various. Radiometric dating (often called radioactive dating) is a way to find out how old Plotting an isochron (straight-line graph) is used to solve the age equation. 3 days ago Bogle graphs radiometric answers dating and grew incomparably excrete to feud for the radiometric and dating graphs line answers.

A particular isotope of a particular element is called a nuclide.

6th Grade: Line Graphs

Some nuclides are naturally unstable. That is, at some point in time, an atom of such a nuclide will spontaneously change into a different nuclide by radioactive decay. The decay may happen by emission of particles usually electrons beta decaypositrons or alpha particles or by spontaneous nuclear fissionand electron capture. The age is calculated from the slope of the isochron line and the original composition from the intercept of the isochron with the y-axis.

The mathematical expression that relates radioactive decay to geologic time is: This equation uses information on the parent and daughter isotopes at the time the material solidified.

This is well known for most isotopic systems. Plotting an isochron straight-line graph is used to solve the age equation graphically. It shows the age of the sample, and the original composition.

### Radiometric dating worksheet answers – Northfield Farm

Preconditions The method works best if neither the parent nuclide nor the daughter product enters or leaves the material after its formation. Anything which changes the relative amounts of the two isotopes original and daughter must be noted, and avoided if possible. Yes, radioactive isotopes present in rocks and other ancient material decay atom by atom at a steady rate, much as clocks tick time away.

Geologists use those radioactive isotopes to date volcanic ash or granite formations like the giant Half Dome in Yosemite National Park. Anthropologists, archeologists, and paleontologists also use radioactive isotopes to date mummies, pottery, and dinosaur fossils. Does this sound abstract and complicated? It is no more complicated than playing a dice game! In this science project you will see for yourself by modeling radioisotope dating with a few rolls of the dice.

### Radiometric Dating

Objective Create a model of radioactive decay using dice and test its predictive power on dating the age of a hypothetical rock or artifact. Share your story with Science Buddies! Yes, I Did This Project! Please log in or create a free account to let us know how things went. Credits Sabine De Brabandere, Ph. Be sure to check the formatting, including capitalization, for the method you are using and update your citation, as needed.

How Old Is That Rock?

## Radiometric dating

That is what we encounter in our daily lives, right? The Earth orbits the Sun in about one year's time, the Earth rotates on its axis every 24 hours, 60 ticks of the second hand on a clock indicates 1 minute has passed. Geologists have a much harder job keeping track of time. Studying the Earth and its evolution, they work with time scales of thousands to billions of years. Where can they find a clock to measure these huge time periods? Or on a slightly smaller scale, where can paleontologists find a clock to tell the age of fossils, or how can archeologists determine how old ancient pottery and buried artifacts are?

Geologists along with paleontologists, archeologists, and anthropologists actually turn to the elements for answers to their geological time questions. We and everything around us are made of atoms. They are mostly empty space with a denser tiny area called the nucleus and a cloud of electrons surrounding the nucleus. The nucleus itself is made of protons and neutrons, collectively called nucleons. Figure 1 provides a visual representation of an atom. Representation of an atom with its nucleus and an electron cloud around it.

Note that, in this drawing, the nucleus is shown disproportionately large. The number of protons within an atom's nucleus is called the atomic number.

It determines the identity of the atom. The atomic number is important for locating an element on the periodic table, shown in Figure 2. You might have seen the periodic table in your science textbook or displayed on a poster in the classroom. What do you know about it?

Periodic table showing elements with their atomic symbol and atomic numbers. In the periodic table, each entry represents an element. The element is listed by its atomic symbol, a one- two- or three-letter long label. For example, gold's atomic symbol is Au. Above the atomic symbol, each entry lists the element's atomic number; e. While an element always has the same atomic number, meaning it has the same number of protons in its nucleus, it can have a different number of total nucleons in its nucleus.

Scientists call these different variations of the same element isotopes of each other. For example, the element potassium which always has 19 protons in its nucleus occurs in nature in three forms: Some isotopes are radioactive. Any idea what the word radioactive means? Radioactive refers to the characteristic that these isotopes are unstable and tend to fall apart. They emit, or radiate, particles in their conversion to stability.

We call this process radioactive decay. Isotopes exhibit a range of radioactive decay processes. Resources provided in the Bibliography enable you to research this topic in more detail. We will explore only the decay processes of interest to geologists. Geologists who want to date objects are interested in the isotopes that change identity as they undergo radioactive decay. In other words, they change their number of protons during radioactive decay and turn into a different element.