Answer:
2 answers:
Answer:
The correct answer is option b.
Explanation:
To calculate density of a substance, we use the equation:
We are given:
Mass of an object = 10 g
Volume of an object = 5 mL
Density of an object = d
Putting values in above equation, we get:
2 g/mL is the density of an object that has a mass of 10 g and a volume of 5 mL.
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Answer:
Astatine is a halogen with several isotopes that all have short half-lives.
Which of the following combinations of mass number and neutrons are possible as isotopes of astatine? Choose one or more:
i) A = 211, n = 127
ii) A = 210, n = 125
iii) A = 220, n = 134
iv) A = 207, n = 122
v) A = 209, n = 124
Explanation:
The mass number is the sum of the number of protons and the number of neutrons in an atom.
Atomic number of At(astatine ) =85
That means it has --- 85protons.
Its mass number A=210
Hence, the number of neutrons in At are:
Second option:
ii) A=210 , n=125 is the answer.