There are two different structural isomers for 2-butene. Single bonded carbon atoms allow for rotation around the C-C bond, however, placing a second bond (producing a double bond) between two carbon atoms stops the rotation around these atoms. How does this restriction of rotation give rise to two different structural isomers of 2-butene (cis/trans isomers). (Hint: consider cyclo compounds which also have cis/trans isomers.)

electron microscopy and scanning tunneling microscopes gives us a greater understanding of atoms by being able to see the atom itself, and lets us see some atomic reactions.

explanation:

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

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since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

i don,t know so just answer mine