What is the basic building block of matter?
A. Atom
B electron
C neutron
D proton
ATOM
A form of matter is uniquely defined by its atoms, which are tiny pieces of substance. An atom is made up of a core nuclei and one or perhaps more negative electrode that surround it.
In the end, the particle lifespan (>1025 years) imposes a limitation on even these stable atoms. However, keep in mind that the main figure for the current life of the universe is 1010 years, making atoms potentially permanent.