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Answer: Krypton
Explanation:
7(14)=84
Krypton, if you look at the periodic table, has an atomic mass of approximately 84. It has a large nucleus, so while it is stable (due to its full octet) the nucleus is probably unstable due to repulsive forces between protons in the nucleus so is probably radioactive.
Option B is a balanced equation and follows the Law of Conservation of Mass. This is because the number of atoms of each element on both sides are the same.
3A (also known as group 13) all the elements have 3 electrons in their outer most shell thats why theyll be divided into the ns2 and the np1
Answer:
0.09 moles of Br₂
Explanation:
Bromine liquid it refers at Br₂ molecule which is liquid at room temperature.
Now to calculate the number of moles we use the following formula:
number of moles = mass (g) / molecular mass (g/mol)
For Br₂ molecule we have:
number of moles = 14.4 / 160 = 0.09 moles of Br₂
