Question

In: Biology

A hypothetical element Ec has an atomic number of 156 and an atomic mass of 300....

A hypothetical element Ec has an atomic number of 156 and an atomic mass of 300.
1. How many neutrons and electrons would be found in a neutral Ec atom?






2. If one proton were removed from Ec, would it still be the same element?





3. If one electron were to be gained by an atom of Ec, would it still be the same element? Would anything change about the element?



Solutions

Expert Solution

Ans. Atomic number = Number of protons

            Atomic mass = Number of protons + Number of neutrons

            Number of electrons = Number of protons

In an atom, the number of electrons (negatively charged) is equal to the number of protons (positively charged) for the overall electrical neutrality of atom.

#1. Number of neutron = Atomic mass – Number of protons

                                                = 300 – 156

                                                = 144

Number of electrons = Number of protons = 156

#2. No.

The atomic number i.e. number of proton is the unique identity of each element. No two different elements can have the same number of proton or same atomic number.

Removal of 1 proton from Ec lowers the atomic number to 155. The resultant nucleus would represent a new element different from Ec.

#3. Yes

Gain of electrons (or removal of electrons) does not affect the number of protons i.e. atomic number of the element. Since the atomic number remains unaffected, the element retains its identity as Ec.

After gaining an electron, the atom gets an additional (-ve) charge on it. It becomes an anion.

For example, chlorine atom (17 protons, 17 electrons) gains an electron to become chloride ion (17 protons, 18 electrons). The atomic number remains unaffected.


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