Sentences with phrase «different numbers of neutrons»

Nick Shackleton calculated changes in past global ice volume by measuring oxygen isotopes (atoms with different numbers of neutrons in the nuclues) in calcium carbon fossil in marine sediments.

Some elements have more than one stable (nonradioactive) isotope — variants of the same substance, but with different numbers of neutrons in their atomic nuclei that alter the mass.

For instance, radiocarbon dating determines the age of biological remains based on the ratio between the carbon isotopes (atoms of the same element with different numbers of neutrons) carbon - 12 and carbon - 14 it holds - this proportion changes as radioactive carbon - 14 breaks down while stable carbon - 12 does not.

(Isotopes are atoms of the same element that have different numbers of neutrons in their nuclei.

Isotopes are versions of elements with the same number of protons, but a different number of neutrons.

Another is to analyze the traces of isotopes — versions of elements with the same number of protons, but a different number of neutrons — found in primitive meteorites.

For this study, the team set out to investigate the timing of supernova dust formation by measuring isotopes — versions of elements with the same number of protons but different numbers of neutrons — in rare presolar silicon carbide grains with compositions indicating that they formed in type II supernovae.

Today is the birthday of Frederick Soddy, an English chemist born in 1877 who pioneered the study of isotopes, elements with the same number of protons but a different number of neutrons.

(Isotopes are species of the same element, albeit with different numbers of neutrons and hence different atomic masses.)

Atomic nuclei which have the same number of protons but a different numbers of neutrons are called isotopes of that element.

Isotopes are atoms of the same element that have the same number of protons but a different number of neutrons — sort of like members of a family who share the same last name but have different first names.

All have the same number of protons, but different numbers of neutrons in their nucleus.

Although they have the same number of protons, they have a different number of neutrons.

The researchers know these particular Buckyballs are extraterrestrial because the noble gases trapped inside have an unusual ratio of isotopes, atoms whose nuclei have the same number of protons but different numbers of neutrons.

Stable isotope geochemistry is the study of how physical and chemical processes can cause isotopes — atoms of an element with different numbers of neutrons — to separate (called isotopic fractionation).

Isotopes are variants of the same chemical element with different atomic weights due to having different numbers of neutrons, such as the most common carbon isotope, carbon - 12, and a heavier stable isotope, carbon - 13.

To answer his questions, Carlson developes novel procedures using instruments called mass spectrometers to make precise measurements of isotopes — atoms of an element with different numbers of neutrons — of Chromium (Cr), strontium (Sr), barium (Ba

Use of Stable Isotopes of Carbon, Nitrogen, and Sulfur to Identify Sources of Nitrogen in Surface Waters in the Lower Susquehanna River Basin, Pennsylvania We know that isotopes are atoms with the same number of protons and different numbers of neutrons.

For example; carbon has three isotopes with different number of neutrons; 12C, 13C, 14C.

Tiny air bubbles trapped in the ice provide a perfect snapshot of the atmosphere thousands of years ago: The fraction of heavy and light carbon isotopes (atoms of the same element but with different numbers of neutrons) inside these air bubbles can not only reveal atmospheric levels of methane but tell researchers whether the gas came from forest fires, wetlands or other sources.