Answer:
SrF2>SrO>RbF>CsBr
Explanation:
Ionic solids have their melting points dependent on:
i) size of the the ion: the smaller the size of the ion, the more closely packed the ionic sphere will be and the greater the melting point.
ii) Charge on the ion, the higher the charge on the ion the greater the electrostatic attraction between the ions and the greater the melting point.
In the arrangement above, the order of cation sizes are Sr2+<Rb+<Cs+
the order of anion sizes are F-<O2-<Br-
This explains the order of melting points given in the answer.
Answer:
6.25 mg
Explanation:
32 days equals 4 half lives for the iodine, since one half life is 8 days. So, the first half life goes from 100 to 50 mg, second from 50 to 25, third from 25 to 12.5, and fourth from 12.5 to 6.25
Answer:
Into what protein structure is spider silk found?
= Primary structure
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Answer:The atomic mass of the second isotope of an element X 17 amu with atomic number of 7 and it is represented by X-17.
Explanation:
Number of protons in isotope X-15,(p) = 7
Number of neutrons in isotope X-15,(n) = 8
Atomic mass of the isotope X-15 = (p) + (n) = 7 + 8 = 15 amu
Number of protons in second isotope of an element X,(p) = 7
Atomic number = Number of protons in an atom of an element
Number of protons in the isotopes of same element remains the same
Number of neutrons in second isotope of an element X,(n) = 10
Atomic mass of the second isotope of an element X= (p) + (n) = 7 + 10= 17 amu
The atomic mass of the second isotope of an element X 17 amu with atomic number of 7 and it is represented by X-17.
Answer:
scientific investigation is the quest to find an answer to a question using scientific method.
Explanation: