It is the short hand of electron destribution (electron configuration). Constructed by putting the symbol of the noble gas in the period before the element in brackets and continuing the electron configuration from where the noble gas left off.
For example: the noble gas distribution of Aluminum is [Ne] 3s2 3p 1
Palladium has 46 electrons. Its noble gas notation is [Kr] 4d10
[Kr] 4d10
PD (Palladium) element 46 has an electron configuration281818
For phosphorus [Ne]3s23p3
No, it is a noble gas
Radon is a noble gas and is radioactive.
Neon is a noble gas.
[Kr]4d105s25p5
[Ne]3s23p5
[Ne]3s23p4
[Ne]3s2
[Ne]3s2
For phosphorus [Ne]3s23p3
For phosphorus [Ne]3s23p3
PD (Palladium) element 46 has an electron configuration281818
For phosphorus [Ne]3s23p3
No, it is a noble gas
Radon is a noble gas and is radioactive.
no. it is a molecule, not a noble gas