When we describe properties of substances, we can divide them into chemical properties and physical properties. Chemical properties are how the substance react with other substances, while physical properties are mostly observable or measurable, which does not require the substance into reacting with other substances.
Since group I are all metals, the physical properties include shiny, malleable, ductile, good conductors of heat and electricity, have high melting points etc.
Chemical properties include react vigorously with water to form metal hydroxide and hydrogen, or react with oxygen to form metal oxide.
The average human body temperature, in Celsius, is 37°.
Answers are:
1) Carbon-14 is a naturally occurring carbon isotope.
2) Carbon-14 has a known half-life.
3) Carbon-14 is present in all living organisms.
Living things have carbon-14 in their organism, but when they died, the amount of C-14 they contain begins to decrease as the C-14 undergoes radioactive decay. Measuring the amount of C-14 in a sample from a dead plant or animal when the animal or plant died.
The half-life of C-14 is about 5730 years.
Half-life is the time required for a quantity (in this example number of radioactive nuclei of carbon-14) to reduce to half its initial value.
Answer:
B.
Explanation: hoped i helped =O