They have a radius of around 1 × 10 10 metres ... as the number of electrons and protons are equal in a neutral atom, chlorine also has 17 electrons. The relative mass of a nucleus is the ...

For comparison, the radius of a typical bacterium is 1 × 10-6 m and the radius of a human hair is about 1 × 10-4 m.

The electronic configuration for the Ni atom is (Ar)(3d) 10 (4s) 2, and the atomic radius is 0.124 nm. At room temperature the crystal structure is face-centered-cubic with a basis of one Ni atom. The ...