Answer:
The number of neutrons is variable, resulting in isotopes, which are different forms of the same atom that vary only in the number of neutrons they possess. Together, the number of protons and the number of neutrons determine an element's mass number.
Answer choices are:
A.It seldom needs refining because of its detailed accuracy.
B. It clearly depicts the particular set of characteristics being modeled.
C. It is an exact visual representation of the characteristics being modeled.
D. It is the same size and color as the scientific phenomena being demonstrated.
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Correct answer choice is:
B. It clearly depicts the particular set of characteristics being modeled.
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Explanation:
In science, a model is a depiction of an approach, an article or even a method or a scheme that is used to illustrate and interpret happenings that cannot be encountered directly. Models are fundamental to what explorers do, both in their investigation as well as when carrying their information.
Answer:
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Explanation:
when the molten outer core cools and become solid ,a very long time in future,the earth's magnetic field will disappear
Explanation:
Water is a polar solvent as the hydrogen and oxygen atom has large difference in their electronegativities.
Oxygen atom is highly electronegative as compared to hydrogen atom therefore, it pulls the electrons of hydrogen atom closer towards itself.
As a result, two poles will create forming a partial positive charge on the hydrogen atom and partial negative charge on the oxygen atom.
Thus, we can conclude that high electronegativity difference between oxygen and hydrogen is the cause of polarity in water molecules.
