Answer: last one is right
Explanation: atoms of same element have always same number of protons but may have several isotopes which have different number of neutrons.
The alkali metals the first group of the periodic table it is highly reactive
Hi,
The atomic number of an element depends on how many protons there are in one atom of that element. If the atom has 3 protons, its atomic number will be 3.
Hope this helps! If my answer was not clear enough or you’d like further explanation please let me know.
Answer:
3. It has a high enough boiling point such that it will not evaporate under the elevated reaction temperature.
Explanation:
The dehydrobromination of meso-stilbene dibromide to form an alkyne requires a very high temperature to run, especially the second elimination reaction of H-Br from the alkene. Therefore, the ethylene glycol used in this reaction is necessary because it has a high enough boiling point such that it it will not evaporate under the elevated reaction temperature, creating complications.