Write the chemical symbols for three different atoms or atomic cations with 4 electrons.

1) Be.

2) .

3) .

Explanation:

1) Be has  an atomic number of 4, thus it has  4 electrons.

2) has atomic number 5, the positive charge on boron indicates that it has lost one electron. Thus, it has also 4 electrons.

3)   has atomic number 6. After the loss of 2 electrons now, it has also 4 electrons.

chemical symbols are used to represent the elements. The main advantage of using these symbols is that we don't need to write complete name of that element. It is the one or two letter designation of the elements.

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.

idk i'm not smart

explanation:

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