The correct answer is B. Isotopes
Explanation:
Chemical elements are defined according to their proton number (particles positively charged), for example, in hydrogen, the atomic number is 1. Also, atoms of the same element usually have the same number of electrons (particles negatively charged) if the atom is neutral.
However, atoms of the same element can differ in the number of neutrons and therefore there are atoms with the same number of protons and electrons but not the same number of neutrons, these are known as isotopes. This variety in neutrons affects the properties of the atom such as reactivity. For example, hydrogen has three isotopes: tritium, deuterium, and protium and form this tritium is the more radioactive.
Twelve water (H2O) molecules were used to make it.
Twelve hydrogen (H2) molecules were used to make it.
Six oxygen (O2) molecules were used to make it.
Six carbon dioxide (CO2) molecules were used to make it.
Answer:
The United States gets 81% of its total energy from oil, coal, and natural gas, all of which are fossil fuels. We depend on those fuels to heat our homes, run our vehicles, power industry and manufacturing, and provide us with electricity.
Explanation:
78 seconds is most likely an outlier.
This is because 66, 68, and 70 seconds are all within 2 seconds apart from each other. Whereas 78 seconds is 8 seconds more than 70 seconds making it an outlier.
Answer:
Make an observation.
Ask a question.
Form a hypothesis, or testable explanation.
Make a prediction based on the hypothesis.
Test the prediction.
Iterate: use the results to make new hypotheses or predictions.
Explanation: