15 points and brainliest!
word bank:
acid, atomic number, base, buffer, chemical bond, chemical reaction, covalent bond, crystalline, hydrophilic, hydrophobic, ionic bond, isotope, matter, neutron, ph, physical property, polar molecule, proton, radical, radioactive

the number of protons in the nucleus of the atom is called the

the number of protons in the nucleus of the atom is called the atomic number.

**brainllest**

most community's take hundreds of years to become stable

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation: