Question

Atom a consists of 10 protons, 12 neutrons, and 10 electrons. atom b consists of 12 protons, 12 neutrons, and 10 electrons.

Answer 1

Given:

Atom a: Protons = 10, Electrons = 10, Neutron= 12

Atom b: Protons = 12, Electrons = 10, Neutrons = 12

Solution:

Atom a:

• Atom a is composed of an equal number of protons and electrons. It means that it is an element.
• As the proton = Electron = Atomic number of the element, atom a is identified as an atom of neon.
• The mass number of neon is 20.17

Atom b:

• Atom b is composed of 12 protons and 10 electrons. It shows that they are not equal. Thus it is an ion.
• In this case, protons are more than the electron, thus it is a positive ion and called cation.

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