Two or more forms of the same element that have different bonding structures in the same physical phase are called

a. isobars.
b. allotropes.
c. isotopes.
d. isomers.


b

Physics & Space Science

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Which of the following is not a SI base unit?

A. kelvin B. kilogram C. newton D. second E. meter

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Scientists are confident that the Moon does not have a large, dense nickel-iron core because

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Physics & Space Science