Answer:
anciet fossils
Explanation:
Radiocarbon dating involves determining the age of an ancient fossil or specimen by measuring its carbon-14 content. Carbon-14, or radiocarbon, is a naturally occurring radioactive isotope that forms when cosmic rays in the upper atmosphere strike nitrogen molecules, which then oxidize to become carbon dioxide.
Pure water or an extremely weak base or acid has a pH close to 7.
Answer:
Cl < S < P < Na
Explanation:
We have to understand the trend for effective nuclear charge before answering the question;
The periodic table tendency for effective nuclear charge: Increase across a period (due to increasing nuclear charge with no accompanying increase in shielding effect). Decrease down a group (although nuclear charge increases down a group, shielding effect more than counters its effect).
Based on this, the elements can be arranged in the following order;
In decreasing order;
Cl < S < P < Na
