Question

Give two similarities and differences between cl and cl-

Answer 1

`Cl=\text{chlorine atom},Cl^-=\text{chloride ion}`

Similarities between
`Cl\&Cl^-`:

• They both have same atomic mass due to presence of same numbers of protons and neutrons.
• Both are from same parent element that is chlorine.

Difference between
`Cl\&Cl^-`:

• The size of chlorine atom is smaller than the size of chloride ion.
• In chloride atom there are 17 electrons where as in chloride ion there are 18 electrons.

Answer 2

Similarities:

1) atomic number is the same. Both, chlorine atom and anion, have atomic number 17. They have 17 protons in nucleus of an atom.

2) both are the same element.

Differences:

1) chlorine atom (Cl) has neutral change and chlorine anion (chloride ion Cl⁻) has negative charge, because chlorine anion has one electron more.

2) chloride ion is much larger than a chlorine atom, 167 and 99 pm, respectively, because attraction between protons and electrons are weaker.