Telegram group: T.me/BBCNOUN [PHY202] Matter exhibits___ behaviours dual [PHY202] The isotopes of an element all have the same atomic number [PHY202] The weakest of the four fundamental interactions is the gravitational [PHY202] It is impossible for two electrons with the same spin quantum number to be in the same orbit’’. According to Pauli exclusion principle [PHY202] According to Pauli exclusion principle. Two electrons in the sameorbitald have opposite spins [PHY202] What parts of its structure are chiefly responsible for an atom’s mass? nucleus [PHY202] The atomic number of an element is the number of protons in its nucleus [PHY202] The property of an electron which gives rise to its angular momentum about an axis within the electron is its electron spin [PHY202] Nearly all the volume occupied by matter consists of empty space [PHY202] Maximum number of electrons that can be accommodated in a shell is given by 2n2