Question 6
A certain atom has 11 electrons, 8 neutrons, and a charge of -1. What is its atomic mass?
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Hey there!

The atomic mass is the sum of the protons and electrons.

The charge of an atom is the difference between protons and electrons.

So, the number of protons is p, and p - 11 = -1.

Add 11 to each side and get p = 10. The atom has 10 protons.

The atom has 10 protons and 8 neutrons, the sum of the two is the atomic mass.

10 + 8 = 18

The atom has an atomic mass of 18.

Hope this helps!  

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.

4d^55s^1 ( third choice)